I also forget to do that at times, but sumtimes I can just use Plan B Lets say the folder name is Ryu-MVC, but the .DEF name is MVCRyu.def
So in the Select.def I put in
Ryu-MVC/MVCRyu, stages/kfm.def
It will register the MVCRyu.def from the Ryu-MVC folder.
This is actually used for chars who have more than 1 character .DEF in the folder