To extract a Cab file automatically
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1)Copy Extract.exe to C:
2)Create new directory c:\Cabs In the Window Explorer,
3)From the Windows Explorer click view\options\file type tab,
 click the Newtype button,
edit under Description of type: Cab Files
         Association extension: Cab
Click the New button and edit under:
           Action : Open
and edit in 
         Application: c:\extract.exe /e /L c:\cabs
and hit Ok, close, close.   
Now just double click the .cab file and it will extract to c:\Cabs
