VFP9SP2 error trying to open project: "Project file ... is in the wrong version."

This project has been under VFP9SP2 for years now. Somehow, the PJX/PJT files must have gotten corrupted. We use SourceGear Vault for VCS. I'm going to grab that last saved project files from the Vault but I just wondered if anyone else has ever come across this error? I might try to manually hack the PJX table first. (The hesitation is that I'm not exactly sure the Vault has the latest PJX, although what's there should be 99.9% right.)