Hi,
maybe some of you have already tried this, but I want to tell this for those of you who didnt manage it.
There is a widcomm bluetooth stack out there for your x51v. (
http://www.aximsite.com/boards/showthread.php?t=122247 ). It works really fine, but if you try to install the x51v driver for your bgp100 you will be unlucky. The gamepad software does not mange it to detect your bgp.
After trying it some minutes, I manged it to use BGP100 under x51v with widcomm driver. Its more then just easy. Instead of using the x51v driver, you have to chose the x50v driver, because x50v is running widcomm from beginning.
Its not a big deal, but maybe there are some of you, want to do this like me :D
I have tried this and all works, and now I can enjoy in playing some nice games :)