I have a similar problem as in Can't delete folder (in Windows 10) that contains special character in that I get the exact same error message when trying to delete a specific folder.
From Can't delete folder (in Windows 10) that contains special character and from Can't delete folder in Windows 7, it seems the work-around is to try to use the 8.3 DOS name.
But, when I do a dir /x, I don't get an 8.3 DOS name... Per the dir help page:
/X This displays the short names generated for non-8dot3 file names. The format is that of /N with the short name inserted before the long name. If no short name is present, blanks are displayed in its place.
So, I guess in my case my directory does not have an 8.3 equivalent and that's apparently a "normal" thing. I did not see any other suggestions on how to delete directories with special characters, short of booting a live version of Linux...
Any other ideas?