Can't open Gorm files from ProjectCenter

[Samuel Harvey]

I read these:

http://www.gnustep.org/resources/documentation/Developer/Gui/Reference/NSWorkspace.html

https://savannah.gnu.org/bugs/?22910

I tried deleting the Converter.gorm created by ProjectCenter, and
recreating it with Gorm; ProjectCenter showed a folder-like icon for
Converter.gorm where it only showed a unknown filetype icon before,
but it gave the same "don't have editor" message.

GWorkspace opens .gorm files just fine.

Is there a config file/menu in ProjectCenter that I'm missing?

Sam H