PMDG entries in the Windows registry

Hi all,While searching an item in the registry having nothing to do with PMDG I tubled by chance over a looooooooong list of PMDG related entries not only containing system related files (as expected) but as well e.g. flight plans, the content of the complete sidstar folder, wav-files. :(Question: Is that normal and if yes why????I'm always keen to keep my registry clean and like to ask what happens if I would delete this stuff (of course after saving the whole tree)? I even do not know which PMDG product is responsible. I do have three candidates: the Queen (B744), the J-41 and the NGX with all variants.