Check in the recycle bin.  If you can't find it, I suggest you post your
question in a newsgroup about Windows (this one is about Access, the
database product).

Be sure to use the big white space to describe the problem in more detail -
like what version of Windows, what folder went missing, etc.

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Ugh! Permissions dilema...
Command Button Password
Can i require password from operating system for mdb file to open?
Security log ins
Hiding Backend Files
Auto join to MDW
References
Workgroup - back ups
Whare are permissions stored?
how to import form,report or module objects with project security