UTIs and CFBundleDocumentTypes

FROM : Rick Mann
DATE : Tue Apr 01 23:16:08 2008

I'm trying to use the editor you get when you get info on a target in 
Xcode to add support to my application to open files ending in ".gpx".

I've added a second line to that editor with what I thought was the 
appropriate information. But I'm confused, because these lines create 
CFBundleDocumentTypes entries, not UTExportedTypeDeclarations, and I'm 
not sure how the two interact; it seems like they are a bit redundant. 
The docs here don't say much:

http://developer.apple.com/documentation/Cocoa/Conceptual/Documents/Concepts/DocTypePList.html

Any other places I should look? Thanks!

--
Rick