Run a Recover on a COPY of the 11 file and try converting the recovered file.
Thanks. I have already run a recovery. No problems were found. I ended up recreating the database.
I had a FileMaker 11 file with an External File Reference that could not be deleted. It was an unnamed external file reference and no way of deleting it works, except to recover the file. The, I converted the recovered file to version 12, and that went smoothy.
Any problem with that as a strategy? The recover log is 100% clean of any warnings or errors.