I have a MacBook Pro early 2015 and just installed Parallels 12 with Win 10. First I have to say that I have the German version of Win 10 and Parallels. So this issue might be interesting only for German members. Whatsoever, when I set MacOS Sierra and Windows 10 to use the same folders Windows Explorer shows to folders: "Documents" which is related to MacOS and "Dokumente" (= German translation for documents) which is related to Win 10. So the Mac folder is not merged with the corresponding Windows folder. In Mac's Finder the folder documents is shown as "Dokumente", because it's translated correctly by the system, but in Windows it is shown in its original version as "documents". What can I do to change "Documents" into "Dokumente"? I hope than there will be only one folder left in Explorer containing all documents from MacOS and Windows, or am I wrong with these expectations?