I used to change the names of bad files also, until I realized that people were still quite happily downloading them as part of swarmed downloads. If they never opened the grouped list, they never saw the world "BAD", which on a Mac is often the only thing I can add, since "CORRUPT" has too many letters. Also there are some movie files that are garbage on the Mac -- QuickTime Player can't always convert rectangular pixels to square, for instance, and these have to be recompressed (hours of work). Or an avi without a header is utterly useless. Most other vid probs can be solved one way or another.