ProjectCenter adding resources directory

[Dirk Lattermann]

Hello,

recently I tried adding an EO model to the resources of a PC project 
and couldn't find a way of doing this, because a model is saved in a 
file bundle (directory), and PC doesn't know this.

Is there a general way to tell the GNUstep system that some file 
extension (in this case ".eomodeld") indicates a file bundle, or must 
ProjectCenter be teached this?

Thank you,
Dirk