[TxMt] opening tmproj from xcode

[Mr. Robert Ullrey]

I was wondering if anyone has figured out how to set the preferences in
xcode to open a tmproj file in textmate? Of course I can control "open
with finder' to get it to open in textmate, but I am looking to set the
preferences to open all tmproj files with textmate as the external
editor. I can not find such a heading in xcodes preferences though. 


Cheers, 
Robert