> If renaming is the answer, is there any sample code to do this safely, taking 
> care of all cases?  (For example, replacement name already taken, or adding 
> an extension if the file doesn’t start with one, etc.)

An idea... move the destination file, if it exists, to the trash.
See NSFileManager's trashItemAtURL:resultingItemURL:error: to do that in a
safe manner.   Trash the old file then save the new.

Marc
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