PHP extension problem in new XP site

Hi all, I've just moved form Win2k to XP (to get my wireless card to function!) and having re-installed everything, but using the most up-to-date downloads (but not v5 yet), I'm hgaving a problem with a script that builds a PDF page from Filemaker. This is the error I get: ================================== Fatal error: Call to undefined function: pdf_new() in C:\Inetpub\wwwroot\fx\cover.php on line 48 PHP Warning: Unknown(): Unable to load dynamic library '.;C:\PHP\extensions;\php_pdf.dll' - The specified module could not be found. in Unknown on line 0 ================================== And the relevant bit from the php.ini ================================== ; Directory in which the loadable extensions (modules) reside. extension_dir = ".;C:\PHP\extensions;" ================================== Does anyone see any problem with my setup? Does anyone have a solution? Other PHP stuff appears to be working fine, though my script hasn't got to the 'smarty' part yet. MTIA George in Oxford