Taking all this into consideration im guessing its an .iso file. Install Daemon Tools http://www.free-codecs.com/Daemon_Tools_download.htm Then run it and find where it says mount image and then point to the file you have. then your computer will act like you just inserted the dvd into your computer. you can then decryptit or whatever. Im pretty sure you could also extract it with WinRar.
Tried all that previously, i have WINRAR but the point is it is open already as i can play it with VLC and Nero showtime.