Acser, really?
USRCHEAT.DAT is not the same as USRCHEAT.RAR -- the RAR file is an archive that contains the DAT file.
As tedmg09130913 already mentioned, you need 7zip to unpack the RAR archive, which will contain a file named USRCHEAT.DAT, which you put in your TTMENU folder.
-Bri