I'm making an OSX screen saver in Xcode (Objective-C, ScreenSaverView class, etc.), and it runs within Xcode correctly. When I navigate to the build output folder and double-click on the the .saver file, it opens System Preferences/Desktop & Screen Saver and asks if I want to install it. All correct.
But when I email the .saver file to myself and open it, System Preferences opens but not to Desktop & Screen Saver and no option to install it is presented. I think it may have to do with the fact that when I build it (with, as far as I can tell, build settings specifying "Release" instead of "Debug"), the output file is still in /Users/Me/Library/Developer/Xcode/DerivedData/ScreenSaver/Build/Products/Debug/ rather than a release folder.
What am I missing here? I have very little experience with configuring build settings, compiler flags, etc.
Edit:
For what it's worth, it seems to work if I compress the output .saver file as a .zip and email that instead. Not a great solution though.
As described in the comment above, apparently it's being built correctly; email messes up binary file attachments so to have it work correctly it should be encoded (e.g. by zipping it) before attaching.