Whats wrong with the following?
The Transform returns an empty xml doc. I have tested the XML and XSL in Internet Explorer and they always return results.

    CoInitialize(NULL);

    MSXML2::IXMLDOMDocumentPtr pXml(MSXML2::CLSID_DOMDocument);
    MSXML2::IXMLDOMDocumentPtr pXslt(CLSID_FreeThreadedDOMDocument);
    MSXML2::IXSLTemplatePtr pTemplate(CLSID_XSLTemplate);
    MSXML2::IXSLProcessorPtr pProcessor;

        pXml.CreateInstance("Msxml2.FreeThreadedDOMDocumen t");
    pXml->async=false;
    pXml->load(_variant_t( m_strSourceFile));

    pXslt.CreateInstance("Msxml2.FreeThreadedDOMDocume nt");
    pXslt->async=false;
    pXslt->load(_variant_t( m_strTemplateFile));

    pTemplate->putref_stylesheet(pXslt);
    pProcessor = pTemplate->createProcessor();

    MSXML2::IXMLDOMDocumentPtr resultxml;
    HRESULT hr = resultxml.CreateInstance("Msxml2.FreeThreadedDOMDo cument");
    resultxml->async=false;

    pProcessor->put_output(_variant_t(resultxml));

    pProcessor->put_input(_variant_t((IUnknown*)pXml));


    pProcessor->transform();

    BSTR theXML;
    resultxml->get_xml(&theXML);
    if(_bstr_t(theXML).length()<1)
        return false;

    resultxml->save(_variant_t( m_strResultsFile));
    return true;

I'm afraid my C++ is pretty lame but two things, does your transform produce xml, not html or text? If either of these last two then you'll need a stream to output to rather than a domdocument.

Secondly you should specify the version numbers on the prog ids and make sure they all match, Msxml2.FreeThreadedDOMDocument.4.0 for instance.

Can you post the xml and xslt if this doesn't help?

--

Joe (Microsoft MVP - XML)