I am attempting to undo the security on a database.  I understand the
process, but the notes I have read indicate that the file with the extension
..bak should be renamed as a .mdb.  My file extensions are .DMB.  Is this a
problem?

Windows permissions problem: cannot lock file
Shortcut target path
How can I inhibit the security warning when starting Access with a Shell command?
Access to Tables
Legal Timestamp in MS Access 2003