How do I register my application as a handler for a new verb for docx files?

[JonDrnek]

Our application generates .docx files for reporting. I would like to add a context menu item to file explorer so there is a new option, "View in " for docx files. I don't want to break the association with Microsoft word. I would like Word to continue to be the default handler for docx file.

Can I do this using wix?

I added the following entries and the context menu entry shows up when my app is the default handler but not when Word is the default handler.

    <RegistryValue Root="HKCR" Key="MyApp.2023.docx\shell\view\command" Value="&quot;[#MyApp.exe]&quot; &quot;/viewreport %1&quot;" Type="string" />

    <ProgId Id="MyApp.2023.docx" Description="MyApp Report File" Advertise="yes" Icon="MyApp.ico">
      <Extension Id="docx" ContentType="application/MyApp">
        <Verb Id="view" Command="View in MyApp" Argument="/viewreport &quot;%1&quot;" />
      </Extension>
    </ProgId>