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!

WinRAR download and support. WinRAR is a powerful Windows tool to compress and decompress zip, rar and many other formats: Download now

Thats becuase winrar is a archiver , Please tell me I got it wrong , U can open any file with the extension , rar , zip and there is loads others. Winzip is jnot very good at the moment but will proboly get better over the years