Please, don't get into an OS flame war. They're rarely productive. Although, as a mac user, I do enjoy the irony of people using one MS OS saying another MS OS is "the problem" :)
Anyway, back to the problem in hand.
To get the path to a file under Vista, it appears that the solution is to right-click on the file *whilst holding down the shift key*, which causes a few hidden menu items to appear, including "copy as path".
So:
- Go to the start menu, select "Command Prompt".
- in the window that appears, type, without quotes, "java -jar " and don't hit enter.
- find the .jar file in the file explorer thingy, shift-right-click and select "copy as path".
- go back to the command window, paste.
- hit return in the command window.
If that opens SnoCAD, you have a file association problem, and given that MS "helpfully" removed the file association editor in Vista (well done, guys), you probably want this :
http://johann.loefflmann.net/en/softwar ... index.html