Error when importing xsl files via '<xsl:import ..>' or '<xsl:include ..>' 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', 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 and it all 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:

• MSXML6 present on the server

• Elevating test application with administrator rights

• Changing application to another 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

• Tried re-registering C:WindowsSystem32urlmon.dll that said it had succeed.

• Searching for HttpOpenDependencyHandle clues in Google