Actually CGI does not name the file what it is named in the filename. (At least it shouldn't be, and doesn't do it instead.) Instead what it does is returns a glob. If you use the glob as a string, you will see the name of the file that they are trying to upload. If you use it as a filehandle, you will be reading from the file.

And yes, I was confused for quite a while about how it worked. :-)