php file upload problem

I have a php upload module that I have used for a while that has been doing a great job of uploading jpgs, pdfs, txt, mov files etc.

Now I want to upload .wmv files, but the browser doesn't seem to pass my file type to php.

If I upload a jpeg file and say:
echo $userfile_type;
it returns "image/jpg"

If I upload a wmv file and say:
echo $userfile_type;
it returns ""
it should return "video/x-ms-wmv"

Anybody have any thoughts on this matter?

Maybe the mime-type doesn't exist on your server. If you're on a *NIX box, check out /etc/mime.types and look around for this mime-type. If it doesn't exist, add it. This could also break depending on how your script figures out what file type it is. If it uses the system call to "file," for example, and wmv isn't defined in the various things that call checks, then you'll need to get it added (I'm not sure how). You could also add some code that checks based on file extension, though that's not so safe -- anybody can rename something before they upload it and put something nasty on your system.