lol issues, it can be a number of things, the way the .cab was programmed, most likey its a server issue imho but Im guessing, because rars do it, some mpegs will do it and so on. Sometimes it works just fine. Its just trying to open it instead of download. Hope this helps explain....its just something u gotta deal with and the reason are .cabs and other files are zipped and not rar'd so they can be downloaded directly to ur device
~Mike