Downloading issue

Hi all....
My issue is that I am trying to download a file off the web that is a zip file with IRD or sometimes STB files. BUT when I download the zip file using my AT&T 8525 it makes it a PHP file and no longer zipped.
Its as if the phone unzip's it and changes the file type for me. (DONT DO THAT MAN)
I need to no is there a way to have the phone not change it to a PHP file and leave it as zip file with the contence staying the same?
Because the files are IRD or STB files that are zipped originaly before downloading them with the phone.
PLEASE HELP FIX THIS.

Phone type:AT&T 8525
Model No. :HERM 100
ROM Ver. :2.15.502.3
Win Mobile 5.0