File Dialog
A file dialog is a window that allows you to enter (or select) a file for loading or save.
A file dialog is used by :
result$ = DDgui_FileDialog$(open% [, filter$])
open% denotes whether you have opened the dialog window for read (open% = TRUE) or writing (open% = FALSE)
filter$ is an extension which filters any file list to those that have the given extension, if given.
If filter$ is not present, then all files will be listed.
If open% = FALSE, then a given filename will have the extension stored in filter$ appended to it (if present). If filter$ is not present, then no extension will be added
This function returns the filename selected or entered.
Notes :
A file dialog window looks like :