This morning I opened my latest project (34TheOther.c3p) and I got that 'Are you sure it's a C3 file' error message. Which I'm told means your C3 file is corrupt. Because YES, it's a C3 file.
I went to Google Drive, found the file and because I hit save obsessively, I have 97 versions of that file. I downloaded version 96. Same error message.
So I downloaded and attempted to open 34TheOther.c3p version 79 from 1:51pm. Same error message.
I then downloaded and attempted to open 34TheOther.c3p version 32 from 11:58am. Same error message.
Then I downloaded and attempted to open 34TheOther.c3p version 1, from 9:51am. Same error message.
If the file was corrupt at 9:51am, why did C3 allow me to work on that project and repeatedly save that project - the Entire Day - without telling me there was a problem?
How do I know that file isn't going to open the next time I use it without closing and reopening the file as obsessively as I save it?
That's an entire day wasted.