I launched ProjectConverter with
python converter.py uvprojx <path to project root>
In folder there is one .uvprojx file.
But inside <RTE> subfolder there is another .uvprojx file (STCUbeMX auto-generated).
ProjectConverter prints out
Found project file: ...
and I see this points to the project file inside subfolder (and not the one in the project root folder.
This is unexpected behavior IMHO.