XnView Software

Wow, seems like I found the way to creating file associations, registry keys and so on - Run XnView as administrator, open Settings, open Association tab, then press "Windows file associations" button. Even on Windows 10 (pressing button doesn't open "Set defaults for apps" for XnView, only show ...

Btw, .psd association registry key:

For exapmle for 2.49.2 version.

Windows 7 (and one Windows 10 PC) - doesn't have .jpeg and .psd associations (so, for example, HKEY_CLASSES_ROOT\XnView.jpeg doesn't exist). See the "second" screenshot (xnview_2492_win7.jpg).

Two Windows 10 (and clean Windows 10 20h2 install) - have .jpeg and .psd ...

And with last 2.49.5 on clean Windows 10 install I have .psd and .jpeg associations (but XnView didn't setup it by default, so Win 10 doesn't see this app for serring as default image viewer in Win 10 setup app)

1) Yes, I use setup file.

2) Hm, very strange. Now, when I open some multiple version of XnView classic (on different PC), thety are have .jpeg and .psd associations in "Set defaults for apps". But in same time for the same versions of XnView (for example, 2.49.2) in one PC i have .jpeg and.psd ...

I love XnView, but I hate situation with file association. Near 5 years ago .jpeg (4 sygn extension) file association was removed from XnView Classic. Now in WIn 10 .jpeg is default file association, which is used to determine default image viewer. So I must manualy create file association for .jpeg ...