Temp. internet files problem?

I have a flash file named primary.swf and I loaded it onto my server along with another flash file that loads primary.swf into it’s movie. I have two other external .swfs that I load the same way as well. But, with the name ‘primary.swf’, when I load it, it does not go into my temporary internet files… does anyone know why? I changed the file name and all the actionscript with it to ‘primary1.swf’ and uploaded it, and it worked fine. Can anyone help me on this? Your help would be very appreciated.