Save a doc/docx file as dotx

Question

In C++/MFC using MS word controller (and not Open xml) how to Save a doc/docx file as dotx??
I am opening the .doc/docxx file, and saving it as .dotx. It saves, but if tried to open when double clicking it, it is says something which means, incorrect file format. Is there a way around?
STDMETHODIMP WordClass::OpenDocument2(BSTR templateFilepath, VARIANT_BOOL readOnly, VARIANT_BOOL visible)
    try
        // Make sure we have a valid MSWordApp object.
        if(m_pWordApp == NULL)
        // Make sure a document is not already open.
        if(m_pWordDoc != NULL)
        CComVariant varFilenameOpen(templateFilepath);
        m_pWordDoc = m_pWordApp->Documents->Add(&varFilenameOpen,
                                   &vtMissing,
                                    &vtMissing,
                                    &vtMissing);
        // Setup the event source sinks so that we will receive sink messages from MSWord.
        DocumentSink::DispEventAdvise(m_pWordDoc);
        if (readOnly == VARIANT_TRUE)
            CComVariant password((long)GetTickCount());
            password.ChangeType(VT_BSTR);
            m_pWordDoc->Protect(MSWORD::wdAllowOnlyComments,    //enum WdProtectionType
                                &vtMissing,                      
 // NoReset.
                                &password);                      
 // Password.
    catch(_com_error &err)
    return(S_OK);
STDMETHODIMP CMSWordController::SaveDocumentAs(BSTR newDocumentFilename)
    try
        // Make sure we have a valid MSWordApp object.
        if(m_pWordApp == NULL)
        // Make sure a document is open.
        if(m_pWordDoc == NULL)
        // Wrap the arguments into Variants.
        CComVariant varFilename(newDocumentFilename);
        // Save the document.
        m_pWordDoc->SaveAs(    &varFilename,        // New Filename
                            &vtMissing,            // Document Format
                            &vtMissing,            // LockComments
                            &vtMissing,            // Password
                            &m_CovFalse,        // AddToRecentFiles
                            &vtMissing,            // WritePassword
                            &vtMissing,            // ReadOnlyRecommended
                            &vtMissing,            // EmbedTrueTypeFonts
                            &vtMissing,            // SaveNativePictureFormat
                            &vtMissing,            // SaveFormsData
                            &vtMissing);        // SaveAsAOCELetter
    catch(_com_error &err)
    return(S_OK);
I called OpenDocument2(...) and then SaveDocumentAs(...).
        

Answer 1

This is the code I am using...
// Wrap the arguments into Variants.
CComVariant varFilename(newDocumentFilename);
// "C:\\abc.dotx" CComVariant varFormat(MSWORD::WdSaveFormat::wdFormatTemplate);
// Save the document.
m_pWordDoc->SaveAs2( &varFilename, // New Filename
&varFormat, // Document Format
&vtMissing, // LockComments
&vtMissing, // Password
&m_CovFalse, // AddToRecentFiles
&vtMissing, // WritePassword
&vtMissing, // ReadOnlyRecommended
&vtMissing, // EmbedTrueTypeFonts
&vtMissing, // SaveNativePictureFormat
&vtMissing, // SaveFormsData
&vtMissing, // SaveAsAOCELetter
&vtMissing, // Encoding
&vtMissing, // INsertLineBreaks
&vtMissing, // AllowSubstitutions
&vtMissing, // LineEnding
&vtMissing, // AddBiDiMarks
&vtMissing); // CompatibilityMode
I am getting an exception, Incompatible File type and File extension.