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.

Press Enter, and then open up another Explorer window. Create a shortcut of your Dropbox, Google Drive, Skydrive, or other cloud syncing folder and drag it to the SendTo folder you just opened up.

Dropbox will now show all your files locally without using any disk space Dropbox will pick up OneDrive's best feature after Microsoft removed it.