7.0.1 I assume. I was using the “read old projects” or something like that then simply saving. My assumption being that AppStudio converts to the .project type. I know this isn’t a heck of a lot of information to go on, looking for a some possibilities about other issues that may have cropped up with the new project format.
It’s alway best to do a “Save to” a new folder the first time you save a project in AppStudio 7. The new folder will have just the files which are actually needed, and the files in the old folder won’t be affected.