Release Notes

• UI optimization
• Added device-based licensing mode
  • Similar to the times-based licensing mode, once activated, daily use does not require an internet connection; Seer can run in a completely offline environment except for activation and deactivation.
  • The licensing state is bound to the current device, and will automatically tolerate temporary hardware information reading failures caused by antivirus software, system permissions, or WMI exceptions for a period of time.
  • Limitations / Trade-offs:
    1. Releasing an activation slot requires deactivation on the original device, otherwise it will occupy a slot. (If you have a computer and it explodes out of nowhere after activating Seer, an activation slot will be permanently lost.)
    2. If you do not deactivate first, check the "clean configuration" option during uninstallation, and re-install/activate Seer after major hardware changes, the server might identify it as a new device, occupying a new activation slot. (Usually, as long as the hardware does not change, re-activating after uninstalling and cleaning the configuration will not cause a new slot to be occupied.)
  • Pricing
    • Personal (1 device): $15.99
    • Plus (3 devices): $26.99
    • Studio (5 devices): $34.99
  • Use promo code YP9TU3JAQY before September 28 to get 20% off

🎦 Multimedia

• Fix memory leak in version 4.4.1 that caused memory to grow indefinitely

📁 Folder

• Archive: Fix a rare crash issue that could be caused by a corrupted file

🎦 Multimedia

• Fix issue where playing audio occupies the device and prevents the system from sleeping
• Add playback_speed_step to user.ini to customize the playback speed interval [0.1, 16]
• Fix issue where new files do not use the adjusted playback speed

🧩 Plugins

• Update Office plugin to 1.5.1
  • Support Ctrl + - / = and Numpad - / + to zoom, and added a button on the control bar to restore to 100%
  • Remove the previous dpr-based scaling

✨ General

• Architecture Upgrade
  • Opening cloud files no longer freezes the main window; a loading indicator is displayed until the file is fully downloaded and automatically loaded.
  • Added support for viewing files inside archives.
  • For archive formats like zip, double-clicking them in File Explorer opens them like a folder; now, previewing files inside these archives is supported.
  • Command line arguments and IPC messages now accept: "seer-archive:///path/to/archive.zip?entry=file.txt"
• The option to load cloud files has been moved from user.ini to Settings > Advanced > Others.
• Established a systematic and comprehensive benchmark test to prevent any significant performance regression for any file format after release.
• Settings > Advanced > Window Position and Size: Added "Center window on every open" option.
• System Previewer
  • Cached data to reduce the time spent fetching the system previewer support list when starting the application.
• Portable Version Improvements
  • No longer writes to %LOCALAPPDATA%. All data is written to the application directory. The portable version still reads/writes %TEMP%/Seer.
  • Autorun on boot no longer modifies the registry; instead, it generates a shortcut in C:\Users\<Username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup.
  • Please ensure that the portable folder has write permission without requiring Administrator privileges. If write permission is missing, a system tray notification will be shown.
  • Updates are synchronized with the desktop version, but clicking download redirects to the GitHub releases page for manual download, decompression, and replacement (typically preferred for package managers).
• Control bar supports more extension-matching parameters:
  • ${type_file} for all files.
  • ${type_folder} for all folders.
  • ${type_all} for all items.

🧩 Plugins

• New users are no longer required to choose a plugin installation directory; the default location is set to %LOCALAPPDATA%/Corey/Seer/plugins.

📁 Folder

• When opening a file inside an archive with Seer, it no longer freezes the main window; it will load in a separate window with a loading indicator.
• Added copy options in the local folder context menu: copy absolute path, copy relative path, and copy selected files/folders.
• Added copy relative path in the archive context menu.
• Archives: Refined data processing methods.
  • More reliable and compatible, handling extreme edge cases better.
  • The trade-off is an increase of about 10% in time consumption and peak memory.

🖼️ Image

1. Image viewing module architecture has been rewritten.
2. Added support for ICO, ICNS, and CUR formats.
   1. Vertical tiled layout.
   2. Each image is displayed at its original pixel size.
   3. Supports exporting the selected image via right-click.
   4. Added more format-specific property displays.
3. SVG rendering engine upgrade:
   • Based on resvg, MIT license.
   • For complex SVG files, the preview speed is significantly improved, and more styles are supported.
   • Fixed the issue with SVG scale jumping on the first frame.
4. Improved raster image scaling: zooming in/out on ultra-large images is no longer laggy.
5. Image background style:
   • Added a background switching feature for transparent images (settings persist only during the current running session).
   • Currently supported: (pseudo) transparent, black, gray, white, and (true) transparent.
6. Loading progress indicator:
   • For large images, the program displays a loading indicator in the control bar.
7. Fixed the issue where fit-to-window calculations were inaccurate in some cases, requiring a secondary fit after rendering.
8. Fixed blank display issues when OpenGL is unavailable:
   • The application will automatically fall back to CPU rendering.
   • Note: Some modules (e.g., video) highly depend on OpenGL; restarting the computer usually resolves OpenGL issues.

🎦 Multimedia

• Changed the playback speed step from 0.1 to 0.2, with a speed range of [0.2, 16].
• Fixed an issue where the preview window and separated window shared the same playback speed.
• Added a subtitle selection option to the right-click menu.
  • Currently supports embedded subtitles and external subtitles with the same filename.

📄 PDF

The fastest PDF viewer on Windows is back. The current loop: Complete refactoring 🚀 -> The best PDF viewer 🪐 -> Feature addition * x & bug fixing * y 🔨 -> Not the best anymore 😭 -> Prepare for refactoring 🤡

New Features

• Added default PDF zoom mode settings:
  • Users can now specify the default open mode, including actual size, fit width, fit height, and custom zoom.
  • "Fit height" is based on the height of the first page.
  • "Fit width" is based on the maximum width of all pages.
  • When "Fit height/width" is selected, window size is required for zoom calculation (default value is 960, configured in user.ini).
• Added a more complete PDF zoom menu:
  • The right-click menu now provides zoom presets, fit modes, the current zoom percentage display, and the option to "Set current zoom as custom default."
  • Default zoom display logic: only the default option recovers zoom from history; custom zoom and fit modes will ignore history upon opening.
• Added a unified PDF display mode:
  • PDF now supports unified display mode switching, including Default, Dark Mode, and Eye Comfort Mode.
• Added viewport tracking in thumbnails:
  • The thumbnail sidebar now displays a real-time viewport frame indicating which part of the document the main view is currently displaying.
• Added customizable page spacing styles:
  • PDF pages now support standard spacing, as well as multiple "seamless divider line" styles, including solid, dashed, and (pseudo) wavy lines.
• Added "Locate current page in thumbnails" function:
  • While clicking a thumbnail syncs the main view, you can now quickly locate the thumbnail sidebar to the page currently displayed in the main view.

Improvements

• Improved response speed and stability when scrolling and zooming rapidly in PDF. Fast, just fast, nothing else. ⚡️
• Reduced white screen flashing and unnecessary duplicate rendering during zoom.
• Improved page positioning and scroll position recovery logic when opening a PDF for the first time, ensuring more stable recovery results.
• Improved sidebar response and initialization behavior, including the loading of thumbnails and table of contents.
• Password-protected PDFs load the preview faster after successful password entry.
• The entire row in the thumbnail list can now be clicked to locate pages, instead of only responding inside the drawn page boundary.
• Fixed an issue where page 0 rendering was unconditionally requested on startup.
• And other miscellaneous fixes.

🌐 HTML

• Nothing here.

📝 Text

• The control bar now displays line endings.

• Upgraded program core support
• Upgraded logging support
• Fixed an issue where the installer could not find the path during upgrade
• Fixed an issue where video logs could not be generated
• Fixed potential crashes when closing audio/video files
• Fixed an issue where SVG and GIF images could not be renamed or deleted in preview
• Plugin: Added DataTableViewer 1.0.1
  • For viewing tabular text (CSV, TSV) and SQLite: csv tsv sqlite sqlite3 db db3 sl3
  • SQLite supports multi-table selection
  • https://github.com/ccseer/DataTableViewer
• Plugin: DataTreeViewer upgraded to 1.1.0
  • Added format support: tml jsonl ndjson cbor xml svg xhtml plist env
  • Added node path display and copy function
  • JSONC and parser experience optimization
• Plugin: MDKAdapter upgraded to 1.1.0
  • Increased scale for r3d and braw from 720 to 1080, assuming you have a powerful computer (as you'll be dealing with these file formats)
  • r3d sdk: 9.1.2
  • braw sdk: 5.1
  • r3d/braw currently do not support renaming/deleting in preview
• Launching on Steam on the 25th of this month, suitable for users who want a non-Store version with device management authorization

• Fixed compatibility issues with old Office plugins
  • If you prefer to use the old plugin for any reason, download it here: https://github.com/ccseer/Seer-Plugins/releases
  • Changes in some third-party libraries are beyond my control. From a programming perspective, it is impossible to stick with libraries from years ago forever.
• Added backup URL for update checks
• Added support for mhtml, mht, xhtml, xht
• Updated f3dviewer-1.1.1
  • Fixed a bug that would hide files
  • Fixed an issue where STEP files might not preview
  • https://github.com/ccseer/f3dviewer
• New plugin: DataTreeViewer
  • For displaying tree-structured configuration files: jsonc, yaml, yml, ini, cfg, conf, toml, tml
  • Supports multi-line display
  • Supports comments
  • Supports sorting
  • Difference from JsonTreeViewer: JsonTreeViewer is designed for large files (hundreds of MB or even GB), while this plugin is for small configuration files
  • Extensible for more similar data structure files in the future
  • https://github.com/ccseer/DataTreeViewer

✨ General

• Fixed a display bug when Device Pixel Ratio (DPR) is 1.
• Fixed an issue where plugin configuration data could be lost.
• The registration dialog no longer appears on the first launch, allowing new users to explore the app immediately.
• Fixed potential rendering and drawing errors.
• Fixed stability issues related to data clearing.
• Added winget for Seer

✨ General

• Added Auto-refresh
  • Refreshes every 500ms when the file in the main window changes.
  • Disabled by default; can be configured in Settings > Advanced.
• Added New Languages
  • Vietnamese, Indonesian, and Arabic.
  • Added translations for the plugin installation process.
• UI Improvements
  • Fixed context menu styling.
  • New Help interface (Tray Icon - About - Help). If you still don't know how to use Seer after all this time, please open Help immediately!!!
• Optimized "Run at Startup"
  • If issues occur, please disable "Run as Administrator" in Seer's settings.
• Fixed an issue where the Spacebar might not respond after File Explorer hangs.
• Fixed an issue where Double-click to open with default program was ineffective for some built-in types.
• Dozens of bug fixes and improvements (Comprehensively reviewed by AI).
• Upgraded crash capture support.
• Desktop Version: Checks license activation to return errors earlier.
  • Thanks for your support! All activation fees are being turned into burning tokens.

🧩 Plugins

• Fixed an issue where a plugin loading failure could prevent subsequent plugins from loading, potentially leading to data loss when saving settings.
• Plugins are now loaded only when their corresponding extensions are triggered, reducing startup time and memory usage.

FontViewer - 1.3.0

• Added font property information.
• Added Save as SVG.
• Added a button in the top-right corner to expand/collapse property information (state is saved locally).
• Added Graph Inspector.
• https://github.com/ccseer/FontViewer

OfficeViewer - 1.5.0

• Updated OIT support.
• Attempted to fix the issue where OIT tries to connect to a printer by default.
• Fixed an issue where Ctrl+W and Esc could not close the window.
• https://github.com/ccseer/OfficeViewer

F3dViewer - 1.1.0

• Updated libf3d support.
• Added XYZ axis display.
• Added more sidebar controls.
• Added local configuration to save preview states (e.g., sidebar visibility).
• Fixed an issue where files with Chinese characters in the name could not be displayed.
• UI adjustments.
• Added more flexible command-line argument control.
  • https://github.com/f3d-app/f3d/blob/master/doc/libf3d/03-OPTIONS.md
  • Example: --render.show_edges 1
• https://github.com/ccseer/f3dviewer

JsonTreeViewer - 1.1.0

• Comprehensive upgrade to professional grade.
• Performance improvements (no more UI lag).
• Added deep search functionality.
• Added interactive status bar.
• Comprehensive visual enhancements.
• Added configuration file.
• Added context menu with various features for different file types.
• Displays detailed error messages on the plugin page if JSON is invalid.
• https://github.com/ccseer/JsonTreeViewer

📁 Folder

• Speed Improvements: Previewing the C:/Windows/WinSxS folder is now ~25% faster (reduced from 1700ms to 1300ms).
• Task Management: Background tasks exit immediately when the window is closed instead of waiting for natural completion.
• In horizontal view: Left-clicking blank space clears selection; Right-click is ignored.

🖼️ Images

• Upgraded RAW image support.
• Fixed preview jitter/shaking issues.

🎦 Media

• Upgraded MDK support.
• Reduced potential crashes; the "Allow renaming during preview" option in settings can now be safely enabled.
• Added more context menu options.

📄 PDF

• Upgraded PDF support (more improvements coming in the next major version).

🌐 HTML / Markdown

• Improved loading speed for subsequent preview pages.
• Markdown Refactor: New loading logic reduces lag, especially for large files.
• Upgraded support for Markdown plugins and updated default styles.
• Added support for Mermaid.
• Added support for TOC (Table of Contents via context menu or shortcut T).
• Supports superscript, subscript, and highlighting (==text==).
• Added support for GFM syntax (strikethrough, tables, task lists).
• Bundled KaTeX font library for offline use and improved speed.

📝 Text

• Improved text encoding detection accuracy.
• Handled extreme cases for very large files (fixed scrolling issues for files exceeding 100M lines).
• Load Speed Optimizations:
  • Regular large file load (1000MB UTF-16LE): 5.47M lines, preprocessing time reduced from 1496ms to 658ms.
  • Ultra-long lines and ultra-many lines maintained at previous levels, near hardware IO limits.
• Added loading progress in the control bar for small file loading.
• Optimization for small files (default threshold 3MB):
  • Regular load (2.9MB UTF-8): Time reduced from 2760ms to 500ms (81.9% reduction).
  • Ultra-long line rendering (2.9MB GBK): Time reduced from 11263ms to 2744ms (75.6% reduction).
  • Ultra-many line rendering (2.9MB UTF-16): Time reduced from 14760ms to 1762ms (88.1% reduction).
  • Note: "Time" refers to the duration from reading to full display (actual perception is faster as content renders progressively).

✨ General

• Crash Reporting Module Updated: Updated relevant DLLs. Ideally, Seer should only use %TEMP%/seer and %LOCALAPPDATA%/Corey/Seer
• Better File Management: For new desktop users, configuration files are now saved in %LOCALAPPDATA%/Corey/Seer by default instead of the Registry
• Improved the System Viewer
• Context Menu for Previewer: A long-awaited (and slightly controversial) addition 🌟🌟🌟
• New Focus Options (Settings > Advanced > Others):
  • Never: (Default) Focus stays on your current app
  • On Window Show: Focus only when the window transitions from hidden to visible
  • On Every File: Focus shifts to the preview window every time a new file finishes loading
• Properties View: Fixed an issue where the Details node state wasn't being saved
• Fixed a bug where Daylight Saving Time changes could cause the app to stop responding
• New user.ini tweaks: Added general - ignored_extensions and SystemViewer - exclude
• Fixed an issue where conversion plugins (DLL and Torrent plugins) weren't working properly
• AI-Powered Localizations: All languages (except Simplified Chinese) have been fully re-translated using AI. If you spot any weird translations or UI glitches, please let us know via email or GitHub

📁 Folder

• Fixed sorting errors in the Date Type column
• Improved overall sorting performance
• Optimized parsing speed for extra-large compressed archives

🖼️ Image

• Better RAW Support: Updated LibRaw to 0.22.0
• Fixed a potential crash when rapidly switching between images while thumbnails were being generated
• New Interaction Logic 🌟🌟🌟: Fit to Short Side and Auto Fit will now scale dynamically with the window size. Original Size and manual zoom will remain fixed regardless of window resizing
• Fixed a bug where copying an image didn't respect the current flipped/inverted state
• GIF Overhaul: Improved previewing with much lower CPU and memory usage

🎦 Multimedia

• Fixed an issue where videos sometimes failed to replay

📄 PDF

• Fixed some obscure bugs that only an AI could find

🌐 HTML

• Fixed a bug where SVG files were opening with the wrong previewer
• Added a new button to the control bar to toggle SVGs back to standard image preview mode

📝 Text

• Fixed the L shortcut key not working
• Fixed an issue where files larger than 4GB couldn't be read
• Smart Copy: For massive files, the copy command now copies the text currently visible in the view instead of taking a screenshot of the text

✨ General

• Fixed an issue where hint text was not showing in dropdown menus within plugins
• Fixed a rare crash that could occur when some modules finished loading
• Fixed an issue where an error window might pop up during system shutdown
• Added support for software decoding libraries to resolve missing driver issues on some devices
• Moved the close button to the far right of the title bar when a window is in fullscreen mode, making it easier to close quickly

📄 PDF

• Added Ctrl + = / Ctrl + - keyboard shortcuts for zooming

🌐 HTML

• Reduced the blank screen time before content is displayed
• Added Ctrl + = / Ctrl + - keyboard shortcuts for zooming
• user.ini: Added an option to hide the Save as PDF button for Markdown files

📝 Text

• The reading position is now remembered when closing large text files
• Added a remember_pos option in user.ini to turn this feature off

✨ General

• Added an option in user.ini to control the visibility of the Separate button in the title bar
• Fixed a rare crash that could occur during loading
• Properties View: Fixed incorrect data display for some .exe files
• Properties View: Fixed the Pin button display issue
• Properties View: Fixed the issue where the second column became too narrow when the first column was too long
• Properties View: Changed vertical scrolling units from rows to pixels for better readability of multi-line data

📁 Folder

• Fixed an issue where NAS folders could not be accessed

🎦 Multimedia

• Fixed width/height display issues in the properties page

📄 PDF

• Fixed stuttering when opening PDFs with extremely large page sizes
• Fixed the horizontal scrollbar position not being restored after reopening the same file

🧩 Plugins

• Added display and editing options for plugin installation paths
• Fixed an issue where DLL plugins could not be lazily loaded
• Fixed display issues when viewers from DLL plugins were separated
• Added Installed and Upgradeable icons to the available plugin page
• When upgrading plugins, command-line arguments of old plugins will be overwritten by the new version, but custom file extension settings will be preserved
• Added command-line parameters to adjust the preview window size: -p 80 (80% of screen), -w 960 -h 1200 (fixed size). -p has higher priority
• OfficeViewer 1.4.1: Added default support for dotx, dotm, and xltm extensions
• FontViewer 1.2.1: Fixed Space key dropdown issue and control bar display issues
• JsonTreeViewer 1.0.1: Supports preview window size adjustment via command-line arguments
• F3DViewer 1.0.1: Supports preview window size adjustment via command-line arguments
• New plugins: epub-1.0.1 and ipynb-1.2.0 — same functionality as script-based previewers, no longer require Python
• Improved PowerShell support for conversion-type plugins
• Conversion-type plugins can now customize preview window size via --seer_viewer_ratio parameter

✨ General

• Fixed an issue where files being written to could not be previewed

📁 Folder

• Fixed incorrect icon shown on the "Open with default app" button in the control bar

🧩 Plugins

• Each built-in viewer module now has an extra_support field in user.ini
• The browser module supports many formats, so by adding basic image formats to this field, you can enable unlimited zooming

🖼️ Image

• Added Default Display Mode under Settings > Type > Image 🌟
  • Fit to window: Prioritizes fitting the image to the window, no scrollbars
  • Fit short edge: Prioritizes fitting the short edge. The long edge will overflow, showing one scrollbar. Similar to shortcut E, but within the window size limit
  • Original size: Displays the original resolution (within memory limits). Scrollbars may appear on both axes
  • ⚠️ Breaking Change: Default is now Fit short edge. If minimap is turned off, the default remains Fit to window
• New shortcuts X / Y to flip image horizontally / vertically. Customizable in settings

✨ Loading Experience Improvements 🌟🌟🌟

• Visual improvement only. Load speed remains the same
• If loading time is within a certain threshold, the loading animation will be skipped
• Configure the threshold in user.ini. Set it to 0 to always see the loading screen
• Some plugins still force the loading screen due to compatibility; will be fixed in the next version

📄 PDF

• Much smoother when loading PDFs with a large number of pages — buttery smooth 🌟

✨ General

• Fixed an issue where path selection checks were missed during automatic installation
• Improved detection of unknown file extensions to support more formats
• Fixed a bug where crash detection wasn't working properly
• Organized and updated all documentation links in the program

✨ General

• Fixed a rare crash that could occur during automatic plugin installation
• Changed the max value of Settings > Advanced > Max preview window size to 100% for more flexibility when setting size per module in user.ini
• The percentage refers to the available screen space (excluding the title bar). In contrast, Keyboard > Hotkey > Fullscreen covers the entire screen including the title bar

🎦 Multimedia

• Disabled rename feature in multimedia preview by default to avoid crashes
• A checkbox has been added under Settings > Types > Multimedia to manually enable it

🧾 Markdown

• Improved a potential issue during preview
• Adjusted to match the background color of the "heti" theme

Thanks for your support ❤

Big thanks to everyone who reported bugs and gave suggestions <3 As of version 4.0.3, the crash rate has dropped to 0.4%! ⭐⭐⭐⭐⭐

✨ General

• All items in Advanced Settings now have mouse hover tooltips
• [General] accept_injected_trigger in user.ini has been moved to Advanced Settings > Others in the UI, default value is now true for new users
• Rename While Previewing: Renaming is now supported for all built-in viewers. Enable delete function via Settings > Advanced Settings > Delete Key
• Fixed a bug in the license module

🖼️ Image

• Improved EXIF data reading
• Fixed a store version specific issue: loading certain JPGs could cause crashes due to EXIF
• Fixed an issue with display errors when switching from the original image to window size
• SVG: Now supports web-based preview. Set exclude=svg under [image] in user.ini to enable this feature

📝 Text

• Fixed the issue where empty text files could not be displayed
• Fixed color theme issues in some custom themes
• Large text view will now also use custom theme colors

📁 Folder

• Hidden files are now visually differentiated with semi-transparency
• Reduced memory usage a bit further
• Sorting function added ⭐
• Folders now show creation time and modification time data

🧩 Plugins

• Fully Automatic Plugin Installation ⭐: Manual addition is still available. The first time you add a plugin, you need to select a storage path
• Known issue: After deleting an installed plugin, reinstalling the same plugin automatically may fail due to the file being in use. Please restart Seer and try again

🙏 Thanks to everyone who reported bugs and shared suggestions — you rock! <3

✨ General

• vc runtime DLLs are back!!! 🎉
• Fixed an issue where clicking links in the update window didn't open them
• Fixed compatibility issues with some versions of PhotoShop
• Fixed the bug where clicking ✔ after changing a plugin's file extension had no effect
• Fixed a rare issue where the interface showed a completely white, empty window
• Fixed a crash when retrieving file properties
• Process Communication: Added new IPC messages — get previewed file path, get Seer version, check file tracking status. See: https://github.com/ccseer/Seer-sdk
• user.ini Enhancements: Added window_size for each module [0.01, 0.95]. Example: [Text] window_size=0.9

📁 Folder

• Local folder previews now follow system settings on whether to show hidden files
• Fixed issues with certain file types (like .vhd) not previewing correctly when multiple previewers are available

🖼️ Image

• Fixed issue where image thumbnails had a pure black background

🧾 Markdown

• Full emoji support: Converts :heart: :smile: :+1: into real emojis
• KaTeX support for math formulas: Requires font resources, so Seer will make CSS network requests each time

📝 Text

• Added custom_theme option in user.ini. Try fancy themes from: https://github.com/ccseer/Seer/issues/460

🔍 Everything 1.5a Support

• Full preview support for Everything 1.5a (no need for filename/path in first columns)
• Still requires Seer to run with equal or higher privileges

🗂 XYplorer & Directory Opus

• Improved support: faster response — no longer saves temp files just to pass data
• Thanks to https://github.com/WKenX for the contribution

📜 Script Previews

• Fixed EPUB script not working
• Updated ipynb script to version 1.1.0
• Scripts repo: https://github.com/ccseer/Seer-Scripts/tree/main/preview

✨ General

• New Translation – Portuguese (Brazilian): Big thanks to @RafaelTavars!
• Fixed some random crashes: Current crash-free rate: 96%. After this fix, it should hit ~98%.
• Fixed dead links in the app
• Skipped path selection during updates (less clicking!)
• Fixed wonky control bar icons
• Fixed cloud files being downloaded locally against settings during preview
• Fixed moving windows being mistaken for "user-resized windows"

📝 Text

• Fixed the exclude option in user.ini not working for text groups
• Fixed preview issues for some unsupported text types

🧩 Plugins

• f3dviewer: New C++ plugin replacing the old HTML-based 3DViewer. Supports most 3D models. https://github.com/ccseer/f3dviewer
• mdkadapter: New plugin adding support for R3D and BRAW files. Make sure the plugin path only has English characters

🎦 Multimedia

• Hardware decoding is now off by default for new users

✨ General

1. x64 Architecture 🥇

   • Overall performance boost with ultra-large file handling capability
   • Critical plugins (e.g., OfficeViewer) now require 64-bit compatibility for future updates
   • Make sure you have MS VC DLL installed: https://aka.ms/vs/17/release/vc_redist.x64.exe

2. Redesigned UI 🥇

   • New color schemes
   • Rewritten UI components
   • Differentiated visual treatments for Win10/Win11
   • Improved font compatibility
   • Draggable pre-preview loading screen
   • Unified icon set across the app

3. Bug Fixes

   • Fixed hover effect disappearance after window dragging

4. Update Module

   • Complete rewrite of update mechanism

5. Optimized Loading Workflow 🥇

   • Loading order follows top-down sequence in Settings > Type
   • Extensions match from top until failure/no match
   • Priority hierarchy: DLL plugins > Embedded types > Converter types
   • Disable hierarchy: Blacklisted extensions > Disabled types

6. user.ini Enhancements

   • Added exclude parameter per group to remove built-in types
   • Enables redirecting file handling (e.g., skip Seer's PDF preview for .ai files)
   • Excluded extensions hidden in Settings > File Types

7. System Preview Integration 🥇

   • Supports native Explorer preview (Alt+P)
   • Manage system-supported extensions via Settings > Type

8. Activation Improvements

   • Fixed network-related activation issues

9. Other

   • Integrated crash reporting system
   • Ctrl+, opens Settings (useful when tray icon is hidden)

🧩 Plugins

• Plugin Framework Overhaul: three plugin types — Converter, Embedded, and DLL
• New UI for plugin management; plugins can now be disabled instead of fully removed
• When adding a plugin with the same name, it will be automatically replaced if the new version is newer
  • OfficeViewer was renamed; please delete the old one and add the new version

JsonTreeViewer 1.0.0 (new) - DLL plugin — https://github.com/ccseer/JsonTreeViewer - Displays JSON data as a tree structure, mainly for large files; supports searching within loaded data - Based on Meta simdjson (MIT)

FontViewer → 1.2.0 - Changed from embedded to DLL plugin — please re-add for it to work - https://github.com/ccseer/FontViewer - Supports custom preview text input - Added fontviewer.ini next to the DLL: remembers preview text and font size - Includes several built-in preview text examples

OfficeViewer → 1.4.0 - Changed from embedded to DLL plugin — please re-add for it to work - https://github.com/ccseer/OfficeViewer - Background loading during preview reduces UI stuttering - Switched from 32-bit to 64-bit, offering better performance

Eps2Png → 1.1.0 - Added a parameter to fix incorrect image size

📋 Property View

• Multi-line display support
• Faster metadata calculations: file/folder counts, directory sizes, hash values
• Shift-key temporary data display (session-persistent)
• Added preview handler label (matches Settings > Type)

🖼️ Image

• Faster rendering with expanded ICC profile support
• Added MiniMap (hotkey M) 🥇
• Expand to max display size (hotkey E) 🥇
• New formats: JXL, JXR, EXR, DDS (partial code from KDE kimageformats, LGPL 2.1)
• Fixed scaling issues for certain formats
• Improved AVIF/RAW support; RAW: fixed half-resolution bug
• SVG: default size capped at 512px for performance; added transparency background pattern
• GIF: frame index display during pause (←/→ to navigate)
• Max file size increased to 150MB for full image preview
• Expanded EXIF support
• user.ini parameters:
  • accelerate: GPU acceleration toggle (default ON)
  • minimap_scale: MiniMap zoom factor [0.5–2.0]

🌐 HTML

• Performance improvements
• Fixed HiDPI scaling latency
• Reduced dark theme flicker for Markdown

📄 PDF

• Fixed history tracking issues
• Sidebar moved to the right; a user.ini option allows moving it back to the left

🎦 Multimedia

• Redesigned progress bar
• Hardware acceleration toggle in Settings > Type > Media
• R3D 32-bit support deprecated (to return as new plugin in Seer 4.1.0)
• Fixed a crash when opening certain MP4 files
• Playback speed is now remembered for the duration of the app session

📁 Folder

• Memory Optimization 🥇: 45% reduction (e.g., 920MB → 500MB for 500k-file ZIP); fixed crash on repeated previews
• macOS-style column view behavior
• Archive file icon support
• 75% faster loading (16s → 4s for large ZIP)
• Fixed accidental file opening via Alt+Arrow

📝 Text

• New language support for syntax highlighting
• Updated color themes (partial code from KDE syntax-highlighting, MIT)
• Full UTF-16/UTF-32 BE/LE compatibility 🥇
• Reduced processing time/memory usage 🥇
• Improved font rendering; user.ini font customization option

• Regression: use focused item as triggered file, not currently selected

• Fixed a crash on startup

• General: When pressing the spacebar in a folder without selecting any files, the folder's content will now be displayed
• General: Fixed an issue where network drives would occasionally become unresponsive
• General: Fixed a problem where some hover tooltips wouldn't update after changing the language
• General: Properties View - Added Shift functionality to toggle text display, making it easier to copy text
• General: Store version - Now uses a different EXE file to prevent incorrect data from causing the activation window to appear
• Folder: Horizontal View - Simple Preview - Optimized to reduce lag
• Folder: Horizontal View - Simple Preview - Text - Handled some edge cases
• Text: Code View - Improved handling of extreme cases
• Text: The widths of line numbers and Minimap are now considered in the default width
• Text: Fixed Minimap display errors in certain cases
• Image: Improved support for the TGA format
• Archive: Fixed a crash issue
• PDF: Outline View - Fixed an issue where the entire outline wouldn't display if some file nodes pointed to page 0
• PDF: Outline View - Some nodes may now include italicized text indicating extra data. Hover to view detail
• Media: Updated libraries

• General: Language - Updated Italian translation
• General: Settings - Type - Now allows you to completely disable certain display types
• General: user.ini - Added new key [Text - minimap_scale] to set the minimap scale (0.5 - 2)
• General: OfficeViewer/OIT - Updated to version 1.3.0
• General: Minor bug fixes
• Media: Backend updates
• Media: Added a thumbnail toolbar for the separate normalized window
• Folder: Simple preview (text & image) for horizontal view (text preview limited to 100 lines/50 chars per line)
• Folder: Archive - Files are now sorted again, case-insensitively
• Folder: Archive - Improved algorithm for faster performance
• Text: Press 'M' to toggle the minimap

• General: Control Bar - Navigation buttons are now disabled by default
• General: Application - Updated the interface library to reduce potential bugs
• General: user.ini Configuration - Added new keys path and birth, read-only
• General: Shortcuts - Use F9/F10 to decrease/increase window size by 15%
• Image: Updated the raw image library, improving support for DNG files
• HTML: Updated the Markdown library for faster performance
• PDF: Updated the PDF library
• PDF: Fixed an issue where the current page number didn't update in some cases
• PDF: Fixed the outline position error when resuming from the last reading position
• PDF: Corrected rendering errors for list items in the outline view
• Media: Updated the media library to reduce potential bugs
• Media: Smoother progress bar during playback
• Media: Smoother loop playback
• Media: Possibly fixed crashes during playback on some machines
• Media: Improved and fixed some behaviors when using the slider
• Text: Improved loading speed for code files
• Text: Fixed lag issues when highlighting large code files
• Text: Added support for new code formats

• Folder: a little bit faster, when previewing C:/Windows/System32, it takes 250ms less than previous version
• Video: new plugin for r3d. it needs to be added in a different way: https://github.com/ccseer/Seer/discussions/399
• Video: fixed qr code error
• PDF: new shortcuts for next/prev page, ] / [
• PDF: fixed shortcuts for Dark/Annotate not working in separated
• user.ini: added 'load_cloud_files' under 'General'
• user.ini: added 'enable_esc_key' under 'General', close window globally
• new variables - ${use_backslash}: replace forward slashes with backslashes
• Files App might support Seer in its new version

• Media: fixed a bug that unable to loop
• Media: embedded subtitles are supported 🥇
• Text: fixed a bug that the highlight might not work
• Text: ability to detect Norwegian language
• HTML: markdown - added a new control button, save as pdf 🥇
• HTML: markdown - heti fixed the bug that image is larger than window
• Settings: two options are turned on to fix a mistake from last version: Automatically check for update and Track selected file in Explorer
• Settings: Controls - data are reset
• Settings: Controls - added a label to show the real command line
• Settings: Plugins - added a label ...
• Settings: Scripts - new module, based on python 🥇 (go Settings - Scripts for more details)
• Settings: Scripts - Controls - unzip (unzip archive file to certain folder), zipfolder (compress the folder as zip file)
• Settings: Scripts - Property - SHA512 (calculate the hash sha512 val), exif (read a lot of meta information for several formats)
• Settings: Scripts - Preview - ipynb (for jupyter notebook), epub (added left/right to switch pages)
• Settings: user.ini - Media - decoders is set to a new value, set to ffmpeg if crashes
• Settings: user.ini - use temp_file_expire_days to define how long to remove temp files
• Settings: user.ini - if you have script(exif) installed, uncheck use_internal_exif_reader to turn off the internal exif loader
• Settings: translation - new: Ukrainian, Norwegian; updated: German
• Settings: translation - new language will be added to a list in Language section
• Misc: Two old plugins, epub and font, are removed since they are both better supported by other modules
• Misc: Win32 edition - installer/uninstaller, fixed the bug that unable to kill the running process
• Misc: Win32 edition - fixed some UI errors in register window
• Misc: Microsoft Store edition - changed the location of the ini files

• Fixed a bug in the license module
• Fixed a bug where clicking 'Check for Updates' did not respond in some cases
• Updated PSD support

• Rewrote license module: each key can be used ten times
• Settings - Advanced: added a user.ini file
• Markdown: load images with relative paths
• Markdown: new style - sivan/heti.css
• Video: use X/C to change speed
• Video: use Ctrl/Shift + Left/Right to seek forward/backward 5x/15x
• Video: support EXR format by default now
• PDF: added an option (user.ini) to fit window width by default
• PDF: fixed a bug where it was unable to rotate
• Image: use scroll wheel to scroll vertically, Alt + scroll wheel to scroll horizontally
• Image: improvements for HEIC formats
• Image: added some new formats
• Plugin: oiio-1.0.0
• Plugin: updated ImageMagick to 1.1.0
• Fixed some other known bugs
• Updated the LICENSE file under the installation folder

• Fixed some plugin-related bugs
• Updated FontViewer to 1.1.0
• Settings - Controls: fixed a bug that prevented saving data
• PDF: centered horizontally by default when there is no historical preview data
• Property view: fixed a bug where the same data might be added twice

• Reconstructed 1/3 of the source code
• OIT updated to 1.2.0
• Added a new font plugin: FontViewer
• Fixed a crash after closing the preview window
• Separated window can separate its sub-files
• Archive: faster speed and less memory usage
• Archive: less UI freezing
• Media: no more black window when loading a file that does not contain video
• PDF: fast, super fast, more than you can imagine
• PDF: annotated view
• PDF: rendered page numbers
• PDF: fixed page width for thumbnails
• PDF: no more UI freezing
• Renamed helper.exe to seerhelper.exe and explorer-hook-client.exe to seerhookhelper.exe
• Separated windows can use shortcuts to change view options, but changes will not be saved
• Minimum time interval to respond to a "SPACE" event is 200ms
• Fixed sequence for Property view: properties - hash - specific info
• Fixed too many bugs to count

• Added API for third-party apps
• Internal support for XYplorer
• Support for the tabbed Explorer in Windows 11
• Fixed font errors for certain languages
• Use Ctrl+N to change all separated windows
• Toggling the "Stay on top" option will no longer hide all windows
• UWP: possibly fixed a bug where settings could not be read/written
• A few other bug fixes

• Added "What's new" to the menu
• Synchronized status for some formats when separating a window
• Added a shortcut, Ctrl+N, to normalize the separated window
• Control bar: extension field can now have more than one suffix
• Added some hidden INI keys
• Folder: double-click an item to open it with the system's default software
• Media: double-click to Play/Pause
• Media: added rotation shortcuts for video: R/L
• PDF: Dark mode support, default shortcut: D
• PDF: some viewing data in the catalog are now saved
• A few other bug fixes

• Video: no more margins
• Video: fixed a crash bug
• Video: black background even in the light theme
• PDF: less margin
• Fixed a bug with DOpus
• Stay on top: fixed a logic error
• New option: Settings - Advanced - Max preview size
• Argument for plugin: *SEER_NO_CACHE*
• New plugin: xmind
• New plugin: code2html

• Some bug fixes for ControlBar App
• Text: some important fixes
• Video: fixed some fatal bugs
• Settings - Advanced: Export/Import
• Generate crash dmp files
• Enhanced RAW image support

• Fixed system tray icon display error
• PDF: fixed two display errors in Outline view
• Folder: fixed display errors of tree nodes
• Text: some important improvements
• Video: fixed the progress bar display error on 1.5x monitors
• New option: Advanced - Video decoders
• New plugin: torrent2json
• New plugin: apkmetainfo2json

• Compatible with Tencent ZMZL

• Updated Spanish translation
• Updated Korean translation
• Improvements for the system tray icon
• Improvements when using multiple monitors with different DPIs
• Compatible with DOpus
• OneDrive: show Property view if a file is not downloaded
• PDF: hide unnecessary buttons when the file is encrypted
• PDF: highlighted parent nodes in Outline
• PDF: added shadows for pages in thumbnails
• Image: fixed the display error of the cursor when clicking the mouse
• Text: fixed decode error for UTF-16LE
• Archive: display file properties when the file is fully encrypted
• Media: fixed some fatal bugs
• Media: show a toast message once when the system is muted but Seer is not
• HTML: updated CSS for Markdown
• Some bug fixes and improvements

• Some bug fixes and improvements

• Some important bug fixes
• Image: SVG now handles W/H shortcuts
• PDF: some bug fixes and improvements
• HTML: improvements when copying images and text together
• New plugin: epubviewer
• New option for plugin: *seer_omit_cache*

• Updated French translation
• Text: the fold icon on the sidebar now displays in a VS Code style
• Text: some improvements for files with extremely long lines
• PDF: fixed a bug where the background was transparent when copying a page
• PDF: added shortcut H to scale current page to fit window height
• Image: added shortcuts for vertical scrollbar: Home/End/Return/Enter
• Image: added shortcuts W/H to fit width and fit height
• Image: changed some interaction designs
• Video: fixed some bugs

• Reconstructed certain code
• Rewrote PDF module
• PDF: added table of contents
• PDF: Rotate action for all files
• Text: fixed shortcuts PageUp/PageDown/Up/Down/Wheel for gigantic files
• Text: fixed copying error bug
• Fixed some other bugs

• Rewrote Text module: can load large text files in seconds
• Image: added shortcut Ctrl + -/= to scale images
• Folder/Archive - Tree View: bold font for parent nodes of the selected item
• Settings - Type: removed some options, use shortcuts instead
• Settings - Type: added 'Remember playback position' (default is false)
• Settings - Advanced - Visibility: Constant/Dynamic option for Control & Title
• Settings - General: some options were moved to Settings - Advanced
• PDF: fixed a crash bug
• Fixed a bug when 'Double click to open file with default app' is set
• Fixed a bug where command line arguments could not be parsed
• Added a new licensing method: Redeem Code

• Updated Italian translation
• Folder: removed dotted outlines when focused
• Folder - Column View: added shortcut Alt+Arrow
• Text: added shortcuts Z (Word Wrap) and N (Line Number)
• Text: replaced the folding marker
• Text: a few small improvements for syntax highlighting of programming languages
• Plugin - eps2png: updated, no more black window
• Plugin - OIT: updated to 1.1.0 (faster)
• Behavior of global shortcut 'Focus' was changed to be based on Z-order
• Updated the backend of several modules: PDF, Video, Markdown, Seer, Log
• Some other improvements

• OIT plugin

• New option: Settings - Advanced - Enable 'Delete' key
• New option: Run as administrator
• New option: Settings - Keyboard - Text
• PDF: show annotations, shortcut is T
• PDF: remember selected page
• Improvements for DOpus
• Folder: provide more info in Property view when viewing a root directory
• Fixed a bug where Ctrl+C was unresponsive in Text view
• About Seer: 'Version 2.5.4+' means running with admin permissions
• Some other improvements

• Supported Everything (www.voidtools.com)
• Folder: different default sizes for different view styles
• Folder: fixed a crash bug when Right arrow key is pressed in Column View
• Folder: added "Go to" (default shortcut: Alt+G, Ctrl+click)
• Fixed a bug when pressing Alt+F4
• Fixed a bug where Ctrl+C was unresponsive in Unknown View
• Dynamic properties (DPI, theme) for Help

• Folder: added "Details" in Column view
• Updated some icons
• Video: added chapter info to slider
• Fixed an error when parsing a ZIP file
• Added Korean translation
• No more loading.gif
• Internal refactoring with many improvements

• PDF: page number is clickable and jumps to the selected page
• PDF: added mouse drag action
• New option: "Auto" for theme
• A lot of bug fixes

• Rewrote the preview window code
• Fixed a bug where system shortcuts 'Win + Arrow' did not work
• Fixed the color error of the Close button
• More EXIF data provided for JPG files
• Rewrote HiDPI support
• PDF: Ctrl+C copies the selected page
• A lot of bug fixes

• Fixed a bug related to the size of HEIF files
• Fixed decode bug for certain video formats
• Fixed a problem where the text module could not zoom in
• Added Ctrl+= and Ctrl+- shortcuts for the text module
• PDF: fit height for single page (shortcut is H)

• Folder view: 'Preview with Seer' is now in a separated window
• Text view: fixed-width font for highlighted code
• Property view: added a Pin button to show the view constantly
• Property view: more info provided for .dll and .exe (e.g., image base, 32/64-bit)
• Rewrote PDF module
• New media module
• Image view: horizontal scroll for touchpad
• System tray icon will show for 5 seconds even if the 'hide' option is set
• HEIC images are supported internally
• Animated PNG files are now supported

• Updated Japanese translation
• SVG: added ability to switch back from code view to image view
• Supported several RAW image formats: ARW, CR2
• Removed the Mask plugin, added "Settings - Type - Disabled"
• Added Android-like toast view to display certain messages
• Improved code highlighting: more programming languages are supported
• Supported extra mouse buttons: forward and backward
• Fixed update error
• Improved performance when viewing folders
• Bug fixes and UI improvements

• New plugin: excel2html
• Some click operations for Folder View
• Save view type for Markdown and HTML
• 3DViewer supports .3ds
• Rewrote Markdown CSS for dark style
• Archive file: view encrypted files
• Archive file: files are now sorted alphabetically (case-insensitive)
• Archive file: more formats supported (e.g., DMG, APK, MSI)
• Archive file: view sub-files in separated window
• Archive file: more property info provided
• Bug fixes

• New plugin: 3DViewer
• Updated the main internal library
• Reconstructed source code for the image window
• Scaling for SVG images
• Refined Markdown stylesheet for both dark and light themes
• Bug fixes

• Control bar: now draggable for position changing
• Control bar: switch preview between files with the same extension in the same folder
• Control bar: all preview controls moved to the right side
• Control bar: all file-level controls moved to the left side
• Settings - Controls: ability to hide navigation buttons of the same type
• Image: double-click the image view to restore size and rotation
• Image/Video: added some touch support
• Text: view XML contents from SVG files
• PDF files (single page only) are now rotatable
• Several optimizations and bug fixes

• Improvements for HiDPI support
• Added shortcut to switch file paths that you already previewed
• Fixed compatibility with Photoshop
• Added touch support for the system tray icon
• Hardcoded plugin data
• A few UI improvements in Settings
• Some bug fixes

• Fixed a fatal bug

• Improvements for Markdown files, and bug fix for custom CSS files
• Improvements for the column view of compressed files
• Improvements for code view
• Bug fix for separated window title bar
• Press the "Shift" key to close all separated preview windows
• Updated Japanese translation (thanks to Kobayashi Yoshitaka)
• Video: restore position only when the duration is longer than 10 minutes
• Video: time indicator is now clickable

• Fixed a fatal bug on Windows 7
• Fixed an installation and uninstallation bug

• New PDF module
• Some improvements in the code module
• Property view: Press Shift to change copying contents
• A few improvements in the media module: automatically hide cursor after 3 seconds
• Support open/save dialogs
• New behavior for the title bar and control bar

• Restored DOpus support
• A double-click related bug fix
• Bug fix for the icon status of GIF play button
• Title bar: bug fix for separate icon status
• Text module: bug fix for encoding detection

• New text module
• Video module: preview in progress bar
• New Markdown engine based on marked.js
• Separate preview window
• Markdown: ability to switch between rendered and source
• New icon set
• Better file type detection
• Restructured source code
• Bug fixes

• New plugin: tex2html
• Settings - Advanced - Tray Icon: hide tray icon
• Settings - Advanced - Tray Icon: tray icon style
• Settings - Keyboard - Media: Go to beginning
• Settings - Keyboard - FullScreen
• Filter available plugins
• DPI aware
• Bug fixes

• New style for installation
• Dimensions info for image types in the Control Bar
• New plugin - md2html
• Column view for .zip and .rar
• Bug fixes

• Dark theme
• Recording playback position of PDF & video for the last 30 items
• Video: automatically load subtitles
• Left/Right/Up/Down navigation in folder column view
• Settings - Type - Other: custom Markdown stylesheet file
• Command line to hide system tray icon: Seer.exe -i
• Bug fixes

• New plugin: exr2png
• New option: open in full screen
• New option: keep window size and position
• Ability to hide the title bar and control bar by pressing 'Ctrl' key
• Bug fixes

• Built-in browser
• Ability to not stay on top
• New translation: French
• Improved media rendering
• Improved PDF loading speed
• Shortcut to reload files: F5
• GIF improvements: use Media shortcuts to control it
• New plugin: code_highlight
• Bug fixes

• Fixed three-day free trial bug
• New translation: Traditional Chinese

• Normalized preview window
• Improved video display and significantly reduced CPU usage
• Markdown HTML source view
• Added new plugin: Rename
• Options in Settings - Advanced: disable folder contents loading, disable file types, ability to reset
• Customized control bar button commands
• Bug fixes: image rotation, crashes when loading huge PSD images, etc.

• Bug fixes

• Read EXIF information for JPG files
• Fixed some image reading errors
• New UI

• Command line call: try command "Seer.exe -?" when Seer is not open
• Two new translations
• More property info for .exe files
• Preview files with no extension
• Detect unknown file extensions
• Reserve window position for each monitor every time it is closed
• New plugin: exiftool (Adobe InDesign - indeed)
• Bug fixes

• Six new translations
• Fixed size for preview window
• Ability to mute media
• Compatible with Listary
• Added Ctrl + mouse wheel to scale images

• Everything is copyable (try Ctrl+C)
• New plugin: Mask

• Plugin checking
• Bug fixes

• The setup file will no longer include plugin files
• New plugin: AutoCAD
• Improved Markdown preview
• Bug fixes

• Fixed plugin adding bug
• More settings and shortcuts
• Customize shortcuts
• Switched Alipay to WeChat Pay
• Improved folder preview
• Media time indication
• Saved text scale factor and fixed margin display bug
• Improved PSD view and fixed crashes with large images

• High-resolution support
• Text decoding detection improved
• Multi-screen support
• Added control bar app
• File properties
• Window focus shortcut
• New "About" page
• User-defined text types

• Added "Auto check for updates" option
• Fixed i18n bug

• Added "Default decoding" option
• Added i18n
• Added plugins
• Added third-party explorer support: Directory Opus

• Fixed bugs to make a stable version

• Fixed installation directory error

• New icons
• Added command line execution (e.g., C:/Seer/Seer.exe E:/A-file.txt)
• Improved user experience in several areas
• Fixed a few logic bugs and display errors

• Significantly improved image loading speed
• Added image controls
• Added directory previews
• Added 'Track selected file' option
• Added a new logo
• Added setup.exe
• Added automatic update checks
• Added AI file format support
• Changed text decoding policy

• Significantly improved PDF viewing
• Added some settings
• Added control bar
• Added 'Format' feature for XML and JSON formats
• Added text file encoding detection
• Added text file decoding options
• Added keyboard shortcuts
• Redesigned appearance

• Hello World