The project file is a plain text file so you can open it and edit it with any text editor. I'm sure it would be a fairly easy task to write a script to do the edits you want to all of your project files. Perl would be a good tool for doing that because it is very heavily oriented to text processing and is freely available.
Martin Fredrickson
Test Engineer
Northrop Grumman
Advanced Systems and Products
San Diego, CA 92128