we encountered a problem on SpaceClaim, during the saving of a SpaceClaim file it is closed.

The file in question disappeared in the directory and instead a file with a ".3bc" extension appeared and it was impossible to open this file with SpaceClaim (original file name: A20068A-EA136-PL01-REV00.scdoc / name after problem: lqaozppk.3bc) .
We managed to open the file again by changing the file extension to ".scdoc".

Have you encountered this problem before?
Do you have an explanation for this problem?