I just found a very useful link, I just want to know that can I use this in Xcode 3.1.4 with iPhone SDK 3.1 (Mac OS X 10.5. Leopard )
I am trying to do that, but can't find the following attributes in the info.plist.
http://www.raywenderlich.com/1948/how-integrate-itunes-file-sharing-with-your-ios-app
http://www.raywenderlich.com/1980/how-to-import-and-export-app-data-via-email-in-your-ios-app
UIFileSharingEnabled and CFBundleDocumentTypes did not become available until iOS SDK 3.2. For additional information, take a look at section title File and Document Support on What's New in iOS 3.2.