To open a CFG. extension, do the following: Right click the file and "Open With" Notepad.
Hopefully this should solve everyone's issues.
As for Jennifer, FH+ is a seperate Folder from FH, you have to locate it wherever you installed it, and edit the music file in there. not the normal FH. Im not sure if you've already done this. A little more information on your issue, i might have your solution.