Problem in IE's File Type Recognition

[knight4vn () yahoo com]

I found out one way to make Internet Explorer ver 6.0 recognize incorrectly type of any particular files.  
E.g one file named "abcd.exe" is Application type but we can force the IE browser to understand that   
file is "Image/JPG" or "Image/Gif" and so on ..
Currently, I'm still working to find the solution allowed us to exploit IE based on this bug.
Does any one have any suggestions?