.dmg needs a default application to run

[PsychedelicEyes]

Hey mac gods,
I just got a macbook for college (free ipod touch!!!) and I'm having trouble running some .dmg files i downloaded off the internet. When i double click it it tells me to choose an application to run it. I have no clue what to use or even if I should select one. Its a game btw if that makes any difference. Thanks!

 

[asme]

DiskImageMounter.

 

[MacBooksRock]

That's weird, I've never experienced that problem... What game is it? Maybe it's a corrupt file??