Hello,
That's indeed a weird bug, especially since that would be atypical of directories but commonplace for programs and files, but I think I might be able to find a fix for you.
Head over to an administrator session of Command Prompt (Start > Command Prompt, right-click, run as administrator).
Enter this in: reg add HKEY_CLASSES_ROOT\Drive\shell /ve /d "none" /f
Then: reg add HKEY_CLASSES_ROOT\Directory\shell /ve /d "none" /f
This should reset the file associations with the Directory type. Let me know if this does anything. Good luck.