SAFE model files of binary format may become corrupted due to:
Files may be recovered through one of the following methods:
Each of these backup files should be located with the FDB file, and should reflect the most recently saved model.
Extended Question: I accidently saved a SAFE model over the previous version. Can the previous model be recovered?
Answer: Once the previous FBK, $SF, and FDB files no longer exist, there is no way to recover the previous model.