Look into a program called SocksCap. It can be used to socksify any normal program. The complication here is that you have to give SocksCap a command line to run, and the btdownloadgui command line will be different for each torrent. One suggestion would be to setup a command line in SocksCap such as " btdownloadgui.exe --responsefile "c:\downloads\file.torrent"". (Substitute any suitable directory in the command.) Now, when you want to open a torrent, save it as "file.torrent" in "c:\downloads" (or whatever you used) and then run the command in SocksCap.