why dont cod4 hacks work on my computor

somebody please tell me what to do my computor dos'nt allow downloads it says "windows cannot open this file
file:e.g sibot

to open this file you need to select a program from the
list if you want to open it.................." and none of them support it please help!!!!!!

if its zip u need winzip or such but my advice use winrar

i could not download any hack before then i downloaded winrar and that really helps!

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