If you start Dragon Player from the application launcher or use (Ctrl+O) from the toolbar or from the menu this window is displayed:
There are three ways to play a video file:
opens the file dialog and allows you to select a file to play.
to play a CD or DVD.
Double click on an entry in the play list with recently opened files to start playing it. The context menu of the play list shows actions to remove a selected entry or clear the whole play list. Any file you played will be automatically added to the list.