O yeah duhh that makes total sense! I've been lucky enough that I haven't had to deal with other DCC's in a while.
Saw this video before rafal explained those steps, might clear things up: https://www.youtube.com/watch?v=QOUYP7My80M [www.youtube.com]
Example with full paths inlc flags:
"c:\Program Files\Side Effects Software\Houdini 20.0.660\bin\hython.exe" "c:\Program Files\Side Effects Software\Houdini 20.0.660\houdini\python3.10libs\vop2mtlx.py" -f D:\circlepattern.hda -n circlepattern2 -o D:\mtlx\circlepattern.mtlx
"c:\Program Files\Side Effects Software\Houdini 20.0.660\bin\hython.exe" "c:\Program Files\Side Effects Software\Houdini 20.0.660\houdini\python3.10libs\mtlx2hda.py" -o D:\mtlx\circlepattern_converted.hda -p D:\mtlx\
"c:\Program Files\Side Effects Software\Houdini 20.0.660\bin\hython.exe" "c:\Program Files\Side Effects Software\Houdini 20.0.660\houdini\python3.10libs\mtlx2karma.py" -o D:\mtlx\karmaNodeGraphs.json -p D:\mtlx\
Edit (easierpaths)