https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/d8433f70-3be6-41d1-a2ec-62233f7a09c3?redirectedfrom=MSDN
[MS-SMB2]: Handling a Set Reparse Point Request | Microsoft Learn
This section applies only to servers that implement the SMB 3.x dialect family. When the server receives a request that
mshandlingsetpointrequest
https://community.dropbox.com/en/discussion/503559/cant-redirect-into-reparse-point-please-choose-different-target-path
Can't redirect into reparse point please choose different target path - Dropbox Community
So, I uninstalled Dropbox. Now I find that my folders; Desktop, Documents, Downloads, Music, Pictures, and God knows what else are all set to my Dropbox...