Re: Corrupted 2 files within short period - "File type not supported"
No idea. But the files really are corrupted.
The first 4 bytes of the file are OK, indicating they may be valid Prime files. The problem must lie furter into the file.
You may want to try contacting PTC support to investigate the files. They may be able to tell you what went wrong. They may be able to recuperate the file. Otherwise, I hope you have a recent backup...