Control-clicking the file also just links to a .php so I guess the forum isn't handling .zip files (even though it shows they are allowed).

Actually, I'm surprised .zip files are allowed. Even google mail won't allow .zip's

Try using LimeWire's forum for programmers: maybe you can ask about the file there more easily http://www.limewire.org/forum/forumdisplay.php?f=67