> Wouldn't you say there are still traces of the old DOS-prompt in there? > > Type e.g. "help doskey" on the Win 10 x64 command line.
That's just part of CMD.EXE's emulation of DOS features to keep corporate .BAT files working. If you try and run that DOSKEY.EXE under real DOS, it gives the "This program cannot be run in DOS" message.