200 Instead of 404

I can't figure this out? If you visit my site to a non-existent PHP page then the server responds 200 and displays a blank page instead of a 404 page. Yet if you go to a non-existent directory then you get a 404. The blank page only happens on a non-existent PHP page. If you go to a non-existent HTML page then you do get the 404 like you should. Example: http://www.cagey.net/doesnotexist.php http://www.cagey.net/doesnotexist.html http://www.cagey.net/doesnotexist I've tried playing with all the different settings for "error_reporting =" in the php.ini file and no matter what setting I use the same results happen. Normally I have "display_errors = off" which is part of the reason for a balnk page. If I change the php.ini file to "display_errors = on" I get the following message: Warning: Unknown(C:\Inetpub\wwwroot\cagey.net\yep.php): failed to open stream: No such file or directory in Unknown on line 0 Warning: (null)(): Failed opening 'C:\Inetpub\wwwroot\cagey.net\yep.php' for inclusion (include_path='c:\php;c:\php\pear') in Unknown on line 0 If anyone has any ideas it would be very much appreciated. THX! Cagey php@cagey.net