Unexpected file format problem

I have a problem with sketchup.
when I open my file it says “unexpected file format”
I don’t understand, I didn’t change sketchup version, I open it as usual and it won’t open.


best solution is to share the problematic file here on the forum, either directly or through wetransfer / a drive.

best case, @colin and his dev colleagues might be able to extract stuff from it.

Yes, please upload the file somewhere that I can take a look.