A songfile Saved as .mgu (Melody included) stays that way unless and until the User wipes the Melody and also Saves the song that way as .sgu. Even then, it would not overwrite the .mgu version.

Try using the Search feature inside BB to search for all instances of songs with the same name, your .mgu files may just be in another folder or something.

BB can do a lot of strange things at times, but changing .mgu to .sgu is just not one of 'em...


--Mac