Remember, way back in July, when we told you how to bring Save As… back to OS X Mountain Lion? Basically, we showed you how to add an Application shortcut to the Edit menu, and then create a keyboard shortcut to invoke it.
The problem with that helpful advice, though, is that it modified both the original file and the newly saved file if you’ve changed stuff before invoking the Save As function.
However, now with OS X 10.8.2, you can fix this behavior. It’s really quite easy–here’s how..