URGENT: IIS server doesn't recognize PHP pages

Hello, I am working for a customer whose ISP uses WinNT/IIS. To test the server environment available I have just uploaded the classic test php page with only phpinfo() inside. When I point to that URL (http://mycustomerdomain.com/test.php), netscape just opens the "Save as (type application/octet stream)" window. This means that the *server* is not set up to fire up the PHP interpreter on files ending with .php, right? What could the reason be? Is it possible that the fault is in the file, for example the CR/LF mess when moving files from Linux to Win**. If it *is* a server problem, what should I suggest to the ISP sysadmin (which is responsive, but knows almost exclusively IIS/ASP/VBScript)? Please help: the customer is starting to scream, and it is really embarassing to be stuck like this when I have a bunch of pages perfectly workiing under Linux just waiting inside my PC. TIA, mweb