That's also what I used to do. The problem is, when Limewire does the group/smart/swarm downloads thing, your "hint" won't be seen. Your file will often be downloaded as part of this swarm and they'll never know.

Perhaps taking the archive file, unarchiving it, add a small .txt file that basically says "This file is corrupt". Add that .txt file to the contents and then rearchive it. Hopefully you'll get a file that'll be slightly larger than the original, so that LimeWire won't "group" it with similar copies. Then your "hint" will be seen.

Hope this helps.....