I just tried to open an old project, and was given the error:
"Failed to open project. Check it is a valid Construct 3 single-file (.c3p) project."
Searching the forums, I found someone posting the same error from 2 years ago. They fixed it by going back and opening it using an older version of C3, then renaming some of their variables, or something.
I went back 1 stable version, and found it opened, but I have no idea how I'm meant to discover what's causing the error.
I tried opening it in the old version, saving it, then opening it in the latest version, but that didn't help either. Will try the latest beta, and will follow up here.
Any ideas Ashley
Update - The latest beta also won't open it. I only had to go back 1 stable version to get it working. A little worrying, as it's a 3 year project that seems to be locked to 368.2.
Update 2 - It seems to be broken from R369 onwards, which is slightly worrying.