You mount the image via Daemon Tools, not with "Open With". "Open With" remembers all the last used programs for a certain file extension. This is stored in the registry. If you want to use another program to open, then select "Choose Program..." within the "Open With" context menu.

As I asked in previous post, if you don't modify anything at all and export, does it play like the original, starting at the menu? It should! If you see a black screen, search this forum for "black screen", there are several posts regarding this.