Version 4.00 doesn't really mark any significant changes but the previous version which was 3.99 could only be logically followed by incrementing the major number.
Version 4.40 brought in the first native 64 bit release which improved the performance of loading large images (more than 25 megapixels).
Installing 64 bit plugins
Opening, editing, and saving JPG, PNG, and TIF files
Creating and playing a slideshow
Playing AVI, MP4, MPG, MKV videos
Playing MP3 and OGG files (needs 64 bit plugins installed)
Playing WAV files (with native msvfw32.dll)
What does not
WAV files do not play without native msvfw32.dll (bug 19496)
WMA and WMV files do not play at all
Install native msvfw32.dll to play WAV files
What was not tested
Installing a native codec pack and/or native WMP to get wma/wmv files to play.
Any features not explicitly mentioned above.
Tested 64 bit Irfanview 4.51.
Installation was to a clean wineprefix, with the Windows version left at the current default (Windows 7). I did not install mfc42, and nothing I tested seemed to need it.
|Operating system||Test date||Wine version||Installs?||Runs?||Used|
|Show||Fedora 33 x86_64||Nov 29 2020||5.22||Yes||Yes||No||Platinum||Artem S. Tashkinov|
|Current||openSUSE Leap 42.2 x86_64||Mar 27 2018||3.4||Yes||Yes||Yes||Silver||Rosanne|
|Show||Manjaro Linux||Sep 06 2016||1.9.17||Yes||Yes||Silver||Muttley|
|Show||Fedora 23 x86_64||Jul 14 2016||1.9.12||Yes||Yes||Silver||Richard Hollins|
|Show||Ubuntu 16.04 "Xenial" amd64 (+ variants like Kubuntu)||May 12 2016||1.9.9||Yes||Yes||Platinum||GP|
|Bug #||Description||Status||Resolution||Other apps affected|
|657||Many games and applications need 'mfc42.dll' ('winetricks -q mfc42' is a workaround)||NEW||View|
|4123||Picasa: "Open with..." menu item grayed out.||NEW||View|
|6682||IrfanView's 4.44 Help -> About window is missing a picture on the left||REOPENED||View|
|9404||cannot select TWAIN source in irfanview||NEW||View|
|9408||Irfanview cannot scan images||ASSIGNED||View|
|19496||Irfanview reports "Invalid MCI Device ID"||NEW||View|
|25166||Multiple mime type handling registered for different file extensions||NEW||View|
|33978||Bug in converting/rendering Windows Metafile (SetWinMetaFileBits etc.)||UNCONFIRMED||View|
|40119||Irfanview 4.x: selection cursor is not correctly aligned||UNCONFIRMED||View|
|42171||IrfanView's 4.44 Help -> About window has wrong placement for textboxes||NEW||View|
|50884||IrfanView WebP plugin edit fields don't accept values above 99||UNCONFIRMED||View|