unable to open Gorm from within ProjectCenter

Hi,

when I double click on a .gorm file from within ProjectCenter a window with 
the following message pops up:

Attention!
Could not open /path/to/gorm.file.gorm

when I start Gorm manually from an xterm window, using openapp Gorm, and then 
open the file manually via Documents -> Open, the main Gorm Project window 
opens, but not the window of my application.

I can create a new Gorm project via Documents -> New Application, then there 
is an open window called "My Window" and I can drag n drop things from the 
palette to it.

what can I do to open Gorm from within ProjectCenter? 

kind regards
Sebastian