How can I play a game with a .d64 extension?

[Stupot]

Sorry if I sound really layman, but I've just downloaded 'How to be a Complete Bastard' (I'm thinking of making an AGS game based on the same idea) and it's a .d64 file which I gather is something to do with it being a commodore64 game (although we had it on our Amstrad yonks ago).  Does anybody know exactly what I need to do/download/sleep with to get this game running?

Cheers guys.

[EDIT]
Unless you know where I can simply find a more accessible version of the game online...

[Gilbert]

If it's a C64 game, just find a C64 emulator, I think there're a bunch around...

I never used C64 emulators, so you have to search around (which should be very easy) or wait for others to reply.

[Kweepa]

Yes, just download VICE from viceteam.org and run x64.exe, then select "Autostart disk/tape image..." from the File menu.
On the offchance it's not a C64 game, try some of the other Commodore emulators that come in the VICE package.

[Stupot]

Cheers, Steve.  I gave it a go and I can get the file up on the C64 screen, but then it won't load the game it just stays on the boot screen saying 'loading'?...  It won't let me take a screenshot to show you.

Or am I actually expected to wait 10 minutes for the game to load, just like the old days? (that would be some faithful emulator)

Got it going.  Thanks man.