file parameter
We need to specify the location of a file on which to apply some processing, be it within graphical or terminal applications.
I.e. in macular : path to graph, path to video.
To look for the file we at least would need to be able to : -filter the browser entries by types of files
And possibly : -specify a message in the browing box to describe the file we want to open (Input video file)
We thus need a new parameter for files, that provides type filter.