Can't remove dropbox folder icon from Win File Explorer

I found a fix by using regedit to search the registry for the string "c:\users\peter\dropbox". If you use this, obviously the string would be the name that is in the Properties dialog box of your ghost system folder icon. It found one entry, "under" a clsid. See screen shot below. I searched for the string that is the clsid (the thing between curly braces), and found it in several places. One of them was here: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace\{E31EA727-12ED-4702-820C-4B6445F28E1A} That contained these values:

Name        Type        Data

(Default)   REG_SZ  Dropbox

I figured from the other data similar to it in the registry that it is where file explorer finds the info it uses to display these icons over to the left. For example, the value right above that reg entry is similar and has "data" = "Onedrive", which is another icon in file explorer. I deleted the key and the ghost icon is gone. Now, since the clsid appears in other places in the registry I likely have some leftover, useless data, but I hope it is not harmful.