on my Vista Ultimate SP1 x64, when I have successfully paired BT device I launch BtProx and click on the "..." button to select the used device, nothing happens.
I've restarted BtProx, but no window is opened when pressing the "..." button.
How could I select the device?
It seems you are using non-Microsoft Bluetooth stack.
What kind of bluetooth dongle do you use? Is it a laptop?
The problem is that you are running 64bit Windows and the bluetooth library used doesn't support 64bit. The bugfix is to compile the source code in 32-bit mode.
(I've tried this on my 64bit machine and it works.)