Problems with open_basedir

I have different domains in same machine (WinNT 4.0 - IIS4.0) and I'd like to limit the files that can be opened by PHP to the main directory in every website. For example: website base directory --------------------------------------------------------------- example1.com c:\inetpub\wwwroot\example1 example2.com c:\inetpub\wwwroot\example2 ......... An error always happens if the value is 'c:\inetpub\wwwroot\' or '.' or any value in parameter 'open_basedir' in 'php.ini' Warning: open_basedir restriction in effect. File is in wrong directory. in C:\Inetpub\wwwroot\example1\test.php on line 2 Warning: Failed opening 'test.inc' for inclusion (include_path='') in C:\Inetpub\wwwroot\example1\test.php on line 2 PHP Warning: open_basedir restriction in effect. File is in wrong directory. in C:\Inetpub\wwwroot\example1\test.php on line 2 PHP Warning: Failed opening 'test.inc' for inclusion (include_path='') in C:\Inetpub\wwwroot\example1\test.php on line 2 Thanks,