How to remove programs from "Open With" list in Windows?

I have a frustrating problem, I have multiple versions of Photoshop installed on my computer (Windows 7) and I already had Photoshop CS5 added to my "Open With" menu and now that I have CS6 installed I can't add THAT one to my "Open With" menu instead! I've tried using the browse button and selecting the CS6 version but it keeps adding it as the CS5 version. Is there some way to edit the Open With menu so I can replace the CS5 version with the CS6 version? I need to keep CS5 on my computer for the time being or else I'd just uninstall it and I'm sure it'd be no problem then.

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