I'm not sure what it is you really want to do, but have you thought about setting up an ftp function to get the file when a button on your form is pressed

Although this is not related to local drives...

Or could it be that when you press a button and you really want the .cgi script to run, your browser asks you if you would like to download the file..???

This normally happens, if I remember correctly, when your web server hasn't been setup to execute .cgi files properly

-----
Of all the things I've lost in my life, its my mind I miss the most.