Why do you want to? Explain the application and perhaps someone could help you.
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Well, I teach Scratch to my 8th grade students and sometimes when they are having a difficult time making something work they e-mail it to me so I can take a look at it. I would like to keep theirs up and open a new scratch to try and do different things or view one I did that was similar and compare it to what they are doing (instead of always reinventing the wheel, I'd like to see what I did with varibles or motion, etc. and what they are doing to know why theirs doesn't work and mine did).
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On Mac OS X, I just copied Scratch and Scratch.image to another folder and I could run both versions of scratch by double-clinking on them.
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