Why does DeleteDirectory[d, DeleteContents -> True] fail for real d?

In[14]:= DeleteDirectory[“Autodesk Fusion 360”, DeleteContents → True]

During evaluation of In[14]:= DeleteDirectory::dirne: Directory Autodesk Fusion 360 not empty. >>

Out[14]= $Failed

I thought DeleteContents->True overrode not-empty directories. Is it a file protection/in-use issue or a bug?