File selection can also be done using DDgui_file :
It's used by :
DDgui_file(id$, text$, filter$ [, width%, height%])
id$ is the widget ID, text$ is some text that will be displayed to the right of the button.
filter$ is a file filter which will filter the file directory listing to the extension that is held in this parameter.
width% and height%, if given, will set this widget to the given width and height. If width% is not present, then the font width (based on the length of text$) will be used.
height%, if not present, will use the font height to calculate the height of the widget
The widget looks like :
