||With SelectFile you can open a dialog box that lets the user specify the name of a file
The standard dialog box for file selection is called up. When the call returns, the variable V[filename] contains the selected file name.
With if Q[ok] you can query whether the user has selected a file.
||TItle of the dialog box
||The initial directory
||One or more filter conditions, separated by semicolon. Example: filter=”*.gif;*.jpg;*.bmp”
||Instead of the “Open” dialog, the “Save” dialog is called up