In XCode how would I get my program to export my whole project as a single file, and how would I create my own custom filetype that my app can understand?

This is a great tutorial on saving documents. Makes an interface too. Reminds me of creating tables in mysql. Refereed to off the Welcome to XCode window.

http://developer.apple.com/documentation...02830-SW11

Wait — whaddya mean by, "export my [your] whole project?" As far as "custom filetypes" are concerned, just plain make your program read/write files. You don't have to "register" it or anything like with another, much more popular (albeit crappy) OS...