I'd like to say hallo to all. I'm new here so please don't kick me for asking questions

I'm based in Cologne, Germany.
Own an Suzi SV1000 which I'm willing to use as work-mule for my test and learn on my Suzi how to work with ECU programming.
I can support with wire harness engineering knowledge (it's my day job) and mechanical engineering.
Now for the question:
I know that TunerPro requires xdf files with map definitions but in most forums only xml files are uploaded.
I understand that the xdf file is actually an typical xml file and therefore I tried to simply use my .xml file and save it with new .xdf extension - well this does not work as I hoped.
What is the correct way to make TunerPro read .xml files?
Cheers