Error when importing xsl files via '' or '' on a 'MS 2012 R2 Server'

If I use <xsl:include href="Book.xsl"> in document in a very simple command line C++ application, based upon the fantastic C++ MSXML 'I can't get xsl:import or xsl:include to work' question in http://stackoverflow.com//, the program throws the following error on a 'MS 2012 R2 Server'.

The procedure entry point HttpOpenDependencyHandle could not be located in the dynamic link library C:WindowsSystem32urlmon.dll

Testing the same command line exe with the same XSL and XML files on Win10 professional works just fine.

If I remove the <xsl:include href="Book.xsl"/> line, there's no error but obviously there's no output.

I've built the test application in MSVC 2015.

Checks/Tried already:

• MSXML6 present on the server
• Elevating test application with administrator rights
• Changing application's compatibility mode.
• Run 'Depends' on the test application and on 'Win server 2012 R2' and there - doesn't appear to be anything wrong.
• Full paths in xsl import and or include statements e.g. <xsl:include href="file:///c:/path/to/Book.xsl"/>
• Tried re-registering C:WindowsSystem32urlmon.dll that said it had succeeded.
• Searching for HttpOpenDependencyHandle clues in Google