If Dropbox opens its app to open and explore files, but you want to open Dropbox files in File Explorer in Windows 10, then it is possible to do so.

Learn how to remove Dropbox icon from File Explorer Navigation Pane in Windows 10. You can use Registry Editor to hide the Dropbox icon from Explorer.

The Windows 10 version of File Explorer has a few new bells and whistles. Here's a handy guide for new users (and Windows veterans) on the new interface.