Hey @stein-tower-19, what happens when you click on the Dropobx icon on the system tray > and then the folder icon? If it does not open Dropobx desktop app, go to Dropobx Preferences... > General tab > Open folders in > choose Dropbox Desktop app.
Or if you choose View in Dropbox from the context menu next to a file?
Do you work or study in the creative industry? If so, which area?