The format and type of data written is based on the file type chosen within
the file management pop-up dialog box. A selection of Text Files
(*.txt, *.csv, *.dat) writes the contents of
data.pts to a text file;
selecting Interpolated Grid Test Files (*.grd) writes the contents of
data.grd to a text file; and a selection of
ESRI Shapefiles (*.shp) writes the contents of data.pts to
a binary file.