IDK about utorrent, but the "filename / path too long" problem happens to me ALL THE TIME under Windows. It is one of the most pathetic things about it, and there's basically no fix that I know of at the operating system level.
People may be using a MacIntosh or LINUX or something to host / download those files since there's much less brain-damage about filesystems in those other platforms.
Try a different torrent software that lets you rename the files (assuming there's no way for utorrent to do it) maybe?
Or you could try saving them to a FAT16 formatted floppy or whatever in which case it'd possibly rename it to an 8.3 name for you... maybe.