Users who have installed FolderSync to enable direct editing and saves "to the cloud" without the need to download/upload documents - may want to configure the WebApp to "Open Locally" by default. To do so - simply check the "Open Locally by default" box under the user menu within the WebApp as shown below:
When checked - any attempt to open or "double-click" a file in the WebApp will use the "Open Locally" feature.