I got them also, mostly in first level directories. They all contain desktop.ini in them which contains:
[.ShellClassInfo]
CLSID={645FF040-5081-101B-9F08-00AA002F954E}
LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-8964
If I delete the directory they reappear instantly with the same file which contains the same contents.