This won't work in practice for most Flash games. They're almost all "site-locked", so they refuse to execute anywhere except in a browser on the domain where they came from.
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Well, most of the ones I've tried have worked. There was one swf that had to be put in a folder with the name of the domain it came from.
I know SWFs can be decompiled -- can they be modified? Can the sitelock code be disabled or altered?
Yes, but I don't think it's something that would easily be automated, so every game would have to have its protection reverse engineered by hand.