I did few more tests. First created PNG file with file name й.png
TESTS
1. Pinta 2.1/Ubuntu 22.10 - File | Open - Works fine.
2. Pinta 2.1/Ubuntu 22.10 - From within file manager select Open With - Works fine.
3. Pinta 2.1/Windows 10 - File | Open - Works fine.
4. Pinta 2.1/Windows 10 - From within file manager select Open With - I get the same error message.
It looks like Windows specific problem. I am marking the bug as Confirmed. Thanks a lot for reporting a bug.
@Cameron, it is interesting that error message refers to D: that does not exists on my Windows computer. Maybe this was the path when some extension was compiled or something. See attachment.
I did few more tests. First created PNG file with file name й.png
TESTS
1. Pinta 2.1/Ubuntu 22.10 - File | Open - Works fine.
2. Pinta 2.1/Ubuntu 22.10 - From within file manager select Open With - Works fine.
3. Pinta 2.1/Windows 10 - File | Open - Works fine.
4. Pinta 2.1/Windows 10 - From within file manager select Open With - I get the same error message.
It looks like Windows specific problem. I am marking the bug as Confirmed. Thanks a lot for reporting a bug.
@Cameron, it is interesting that error message refers to D: that does not exists on my Windows computer. Maybe this was the path when some extension was compiled or something. See attachment.