Whereever that came from:
After a long time I checked the library setting for the music files.
And guess what: all the strangely open files were there as locations to watch.
I am absolutely positve that I did not add the folders and files to the library.
The library in the Explorer also did not show these files and folders.
Anyway: removing the files and folders from the "watched folders" list closed them immediately.
Case resolved.
(Sorry, no-one could have guessed this from the outside.)
1 Like