write down:
1: mount c c:\......\Double Dragon 2
2: c:
optional: dir <-- to see if the mounting worked
if you see a folder called 'Double Dragon 2',

k:
3: cd Double d~1 (I believe, maybe it is smart to rename the folder into DD2 or something)
4: run the executable
5: play!
In the future, please start a new topic.
Happy gaming!