I work heavily with BorlandProjectGroups (well, Project Groups), which used to be .bpg files in older delphi versions (like delphi 7), and it looks like .BPG and BDSGROUP are covered, but once again, Embarcadero changed life around for us in 2009, and we've got .groupproj files in Delphi 2009. New file extension, and new content type. Hey, Delphi 2010 might come out in a few months and support yet another bunch of file types for us all to get used to.
Isn't it FUN kids?
Hopefully for future versions Embarcadero stops endlessly tweaking all this crap and lets it settle down a little. Sigh. Anyways, more work for the fine folks who make FinalBuilder. I really really need this. I have lots and lots of .groupproj files now because I have been working solidly in Delphi 2009 for almost the entire time since it's been released, and I have a lot of groups containing a dozen or two dozen related component packages (here's a killer) because I have over 200 packages installed into my Delphi 2009 IDE, and manage building them right now with about a dozen or more large .groupproj files containing lists of related component packages. (A few are in house, but 90% of these are suites of purchased components we want to try to build all inside FB.)
Warren