There were numerous updates, here are only the more important things.
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Version 2.15
- Multiple (animate) GIF Support ! IrfanView is the first graphic viewer 
  WORLDWIDE with Multiple GIF support. (One known bug: with some specially 
  transparency combinations)
  Much fun :) 
- New menu: Convert to 256 colors (for true color images only)
- Some WMF bugs are fixed (with old (Win 3.x) WMFs)
- Now: "Save as" with lower case names
- And you can copy my E-Mail address from "About-Box" :)
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Version 2.12
- The GIF-Decompression is now totally rewritten ! I hope without bugs :)
- Windows metafiles support (WMF=Windows Metafile and EMF=Enhanced Metafile)
- Command line support for AVIs (Fullscreen for AVI is not available)
- Some minor bugs fixed (startbar, extensions etc.)
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Version 2.10
- Print support
- "Always fit to desktop" was changed to "Always fit to desktop for big images"
- Some minor bugs fixed (GIFs, rotate under WinNT, overlapping)
- NEW ! Command line options: /one, /fs, /bf, /pos=(x,y), /title=text :
  /one        - force "only one instance"
  /fs         - force Full Screen
  /bf         - force Best Fit
  /title=text - set window title
  /pos=(x,y)  - move the window to x,y
Notes:
- Only lower case options are supported:
Examples: 
   i_view32 test.bmp /BF                 = incorrect
   i_view32 test.bmp /bf /title=My PIC   = correct
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Version 2.07
- AVI support (video for windows)
- Jump to first/last file in the directory (CTRL+F,CTRL+L)
- New option: always fit to desktop (properties->other options)
- Finally: "Save as", non-extension support
- Read support for extensions: *.jpeg, *.tiff
- Correct displaying of all Photo-CD files (rotate)
- Copy/move/delete windows
- Copying/moving: Replace question if the file exists (replace of read-only files)
- More hotkeys (rotate, flip, properties, image info etc.)
- Some minor bugs fixed (GIF,RAS)
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Version 2.05
- Edit options (Copy/Paste/Delete/Clear Clipboard)
- New in "Properties->Other options": allow Only 1 instance of IrfanView32
- Read-Header function is implemented, warning if incorrect extension
- Some fast-directory-view bugs fixed (like: last image)
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Version 2.00 
- Progressive JPEG support (read/save) 
- Alphabetical sorting of images in directory 
- Some minor bugs fixed 
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Version 1.99 
- New fast directory view ! This part is now totally rewritten; 
  no more lost files and uncomplete lists. Files are shown in the 
  order how they stay in FAT, that means unsorted. Coming in next release: 
  sorting files in alphabetical order. 
- Fixed bugs with some ICOs, and compressed BMPs 
- "Read ahead" - processing next image in the background is not implemented. 
  It doesn't bring wished effects, especially on faster machines (pentiums).
  Why?
  Because the background processing of the next image slows down showing 
  of the previous (even on faster computers, even with faster graphic cards). 
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Version 1.98a
- Fixed bug with 256-colour-ICO
- Fixed bugs with fit-to-desktop and resize
- New menu outfit
- Zoom percentage shown in title bar
- Positioning window somewhere else than top left 
  corner
  (biggest known bug: IrfanView still can NOT correctly
   resize images whose dimensions exceed actual screen 
   resolution; if you do not want to cut edges of your 
   image, void saving in this situation)
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Version 1.98
- Viewing ICO 
- Zooming in and out 
   in: 150, 200, 250, 300, 400, 500, 600, 700, 800, 900 %
   out: 90, 80, 70, 60, 50, 40, 30, 20, 10, 5 %
   (known bug: zooming in large images works till
    now only up to 500 %)
- Resize image
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Version 1.97
- Viewing RAS
- Fixed some bugs with fast directory view and GIF
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Version 1.95
- Viewing TGA
- Image flip/rotate
- Image copy/move to another directory
- New tab-dialogs (Menu: Options->Properties)
- IrfanView32 doesn't support Win32s any more
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Version 1.90
- Viewing Photo CD
- "Fast directory view" (jump to next image in the
  current directory with space, to previous with
  backspace)
- Set image as wallpaper
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Version 1.85
- Windows 95-dialogs (open/save file)
- Viewing 2 bits per pixel PNG
- Saving file as TIFF
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Version 1.80
- Viewing PCX and RLE
- Viewing grayscale TIFF
- Fixed some bugs with GIF
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Version 1.70
- Viewing TIFFs (uncompressed, LZW, packbits, Huffmann
  fax group 3, fax group 4)
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