Self calling files - not working

Greetings, I have tried to find the answer to the question I am about to ask, in all other cases I have found the same question but no answer. I am trying to get my head around PHP and have been working with some of the examples in the book - Programming PHP from O'Reilly. Example 5.2, pages calling themselves, is giving me a particular problem. I have setup a PC running Windows, Xitami, PHP, MySQL, Perl etc. I can test most of what I have created so far has run without a problem. However, 5.2 will execute fine from within the root of the server (c:\xitami\webpages) but go any deeper into the tree and I get the following "Bad request: probably tried to POST a non-executable URL". Can someone tell me which switches I need to set and mods to the path? Martin