How can I import that erased folder located in a .cmf file back in my
regular .pst file?
As far as I know, ".cmf" is not a file type Outlook uses. filext.com says
it's either a Connection Manager Fixer file, a CopyMate data file, or a
Corel Metafile. Fileinfo.net says it could also be a Creative Music File
used by some Sound Blaster utilities. Not an Outlook issue.