I am trying to install vBulletin 3 onto a Windows 2003 server which is running the Plesk control panel system. When I run the installation, I get a PHP error:

Warning: chdir(): No such file or directory (errno 2) in C:\Inetpub\vhosts\domain.com\httpdocs\install\install.php on line 17

Warning: main(./install/installcore.php): failed to open stream: No such file or directory in C:\Inetpub\vhosts\domain.com\httpdocs\install\install.php on line 69

Fatal error: main(): Failed opening required './install/installcore.php' (include_path='.;./includes;./pear') in C:\Inetpub\vhosts\domain.com\httpdocs\install\install.php on line 69

After doing research and asking vB support, I have narrowed the cause to IIS itself. The include() statement in the files uses ./path/to/file.php in the path, which causes an error. But when I remove that ./ and replace it with ../path/to/file.php then it works without any problems.

Does anyone know of any fixes for this? Why is IIS not liking the ./ in the path?

Check Plesk control panel requirments, has it been built to work on IIS or Apache?

ChocIST

Yes, it works with IIS by default on Windows.

have you enabled parent paths for IIS6?
They turned them off by default.
Site properties > home directory > config > options > enable parent paths
You als need to ensure that SSIs etc have been allowed through Web Service Extensions configuration.