Prevent iCloud window from opening on OSX 10.8 app launch

Question

I have written an OSX app that uses iCloud document storage. Whenever I open it in Mountain Lion (not on Lion), an iCloud window opens that looks like the following:

Answer 1

The applicationShouldOpenUntitledFile: from iCloud enabled - Stop the open file displaying on application launch? was not working. After lots of experimentation, I figured out that if I remove the NSDocumentClass key and value from my Info.plist in the CFBundleDocumentTypes array, the window is no longer opened.