Before switching to Ubuntu I was using a back-up software called Drive Snapshot on Windows, which would make files with the extension .sna and with which I could recreate a partition. It also had a "Browser" function with which you could see the content of a partition without restoring it.
Now I have the files, but I can't browse them to recover my files. I tried it with Wine and my original program, but it doesn't work.
I know that the simple solution is to use another computer to recover the files, but I liked very much that program

Saying "it doesn't work" doesn't help. Posting details (error messages, whatever) might. If this application makes 'dd'-type copies you might be in luck, but I doubt it. There's a reason for many ClippyOS to favouring obfuscation, violating standards, and proprietary file formats. What does running 'file' on one of the .sna files return?

When I use the program's "Explore and Mapping" feature (to see the content of the files), nothing happens. No error message, nothing shows up.

And what does running 'file' on one of the .sna files return?