Here's a link to the game on my server:
http://www.roguelantern.com/roger/Works perfectly on;
Firefox (WinXP)
IE (WinXP)
Safari (iOS)
So... looks like it's got to do something with your computer.
Can you try the link above and see if the problem still persists?
If yes, I suggest you check your computer file associations for files ending in .a from Windows explorer / Tools / Folder settings (or something similar depending on your system), is there .a there associated to something? There should not be.
You could also try installing Firefox. Then re-try the link above.
Other than that, no ideas.