XnView Software

"Doesn't suport Unicode natively" doesn't mean "can't get access to file's content in principle".
Yes, but sometimes it is slightly inconvenient.
XnView is good software if you have encountered first issue only 2,5 years after joining forum, right?
I do not argue with this. With xnveiw of ...

XnView 'Classic' doesn't support Unicode...

Then it is clear. I thought it there was a bug.

I can't open files with special symbols or hieroglyph in file name. For example xnveiw does not open files with such symbols in a file name as ▲, ほ, ～. It leads to an error: Error opening the file <F:\^.jpg> (symbol - ▲) <F:\~.jpg> (symbol - ～) <F:\?.jpg> (symbol - ほ)
OS: windows 7