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[what2be]

Im not completely understanding what this dat does for mame, does it simply compare the mame datfile with a users roms and rename the users roms that are named incorrectly but still have the correct CRC values?

Do I need to import it once for any mame dats I currently have AND again if I import or create a new mame dat? What about multiple folders in the profile window? Do I do it for each profile that contains a mame.dat or do I just add it to the root "profiles" folder? 

[Roman]

RenameSet.dat is only a collection of how set names changed over time of MAME releases.

It has nothing to do with cmpro.