issue with PHP_XSLT?

hi, i got a problem. i installed sablotron (expat etc) and it seems to be working. my directory structures are like this: webroot = c:\apache\htdocs phproot = c:\apache\php i try putting my xsl files (1.xsl, 1.xml) into HTDOCS but it doesnt work and tries to look for the files in my PHPROOT! so, when i put the files in "c:\apache\php", it works. why does php_xslt.dll expect the files to be in PHP root? how can i change this to be able to pick up files from the document root itself? thanks, ben