DropBox
  * Overlay Icons
    * ''HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers''
    * [[http://superuser.com/questions/809529/which-dropbox-icon-is-for-which-icon-overlay-identifier-name]]

^ Name         ^ Color ^ Meaning                ^
| DropboxExt1  | Green | Synced!                |
| DropboxExt2  | Blue  | Sync in progress       |
| DropboxExt5  | Red   | Sync not happening     |
| DropboxExt7  | Gray  | A folder isn't syncing |