problem with doom 3 demo

well i downloaded doom 3 demo...and when i was gonna extract the file with the program winrar nothing happend.the file was in the zip folder but i couldnt extract the file ...what the hell? i downloaded the dome 3 demo 3 times and had the same problem..i even tried different sites.did u guys had the same problem?

 

What sites did you download from? Some may not be legit versions of the Doom 3 demo, or even fakes. Therefore, they may not run well for some computers. That's all I've got.

 

I used WinZip to decompress it, which worked fine. Unlikely that you got 3 corrupted downloads in a row, but it's possible. Or a bogus download, that even that should unzip.