Why Http Messages = ..\--- INI setting doesn't work for .php files

[Mouton]

ioFTPD.ini:
[HTTP_Service]
...
Messages = ..\text\http

https://localhost:10000/test.php:

Warning: Unknown(D:\ioFTPD\text\text\http\test.php): failed to open stream: No such file or directory in Unknown on line 0

Warning: (null)(): Failed opening 'D:\ioFTPD\text\text\http\test.php' for inclusion (include_path='.;c:\php4\pear') in Unknown on line 0

Changing ioFTPD.ini to:
[HTTP_Service]
...
Messages = D:\ioFTPD\text\http

Fixes the problem.

Both settings works for .html files.