Overture - Graphics Problem - Fix for MAC platform

[eXistenZ]

I resolved the mistery of the DEMO file.

the file I downloaded is PenumbraOvertureDemo_1.0.3.dmg.bz2, so i tried to decompress it to obtain the dmg, now i noticed that the bz2 file has the same md5 written by Urkle, so the solution is to delete the extension bz2 from the file name and open it like all dmg files.

Now the question is: why there is that wrong extension?