I've confirmed this on fresh install from Win8 & 8.1 isos on VirtualBox with 4.38. Here are steps to reproduce:
If you try to open bmp or jpg file, Windows will show you this http://i.imgur.com/4wQik2B.png and clicking on IrfanView will now fix association for that filetype. You can also check those unchecked file types in "Set Program Associations".
BUT!
With this come another major bug, assuming you checked those unchecked file types, now open IrfanView and go to Options -> "Set file associations", then just click OK and go to "Choose defaults for this program" or try opening jpg, you will see it's like before.
- Start IrfanView install, on Associations page click "Images Only" (and uncheck Chrome install of course)
- After IrfanView starts, go to Options -> "Set file associations" and notice all image formats are checked. You can close it.
- Now in Windows, open Control Panel -> Programs -> Default programs -> Set your default programs
- On the left click on "Irfanview", then on the right "Choose defaults for this program", then click on column "Current Default" and scroll down to see that some are "Not selected" like BMP or JPG http://i.imgur.com/42PqFPH.png
If you try to open bmp or jpg file, Windows will show you this http://i.imgur.com/4wQik2B.png and clicking on IrfanView will now fix association for that filetype. You can also check those unchecked file types in "Set Program Associations".
BUT!
With this come another major bug, assuming you checked those unchecked file types, now open IrfanView and go to Options -> "Set file associations", then just click OK and go to "Choose defaults for this program" or try opening jpg, you will see it's like before.
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