PowerPoint object problem

[junkjones]

I am trying to pull the number of slides from a powerpoint presentation using CFSCRIPT and some code I found on the MSDN website, however I'm getting this error:

<CFSCRIPT>
objPresentation = objPresentations.Open(&quot;filename&quot;, False, False, False);
BDP = objPresentation.BuiltinDocumentProperties;
customShow = BDP.Item(&quot;Number of Slides&quot;
…

</CFSCRIPT>

Error Diagnostic Information:
Arguments expected by object does not match arguments specified

Any help is much appreciated!!