Creating menu for a video file (not for DVD)
Looking at what Mr Henderson was saying, it appears you will need to have some basic programming skills to do what you want.  The system he provided a link to appears to be based off of a markup language (similar to HTML if you've used that).  If you aren't afraid to get your hands dirty with some basic programming that would be the way to go.
(details here: http://forum.doom9.org/showthread.php?s=&amp;threadid=66583)

Alternatively you could use Encore and create an image (ISO) of the DVD, but I'm not sure if it's possible to run a disk image independently of a disk.

I will play around with Adobe Encore tomorrow and see if there is a way to export a standalone menu.