diva gis - How to load and view .gri and .grd files in QGIS

An online GIS Repository called DIVA-GIS (http://www.diva-gis.org/gdata) offers data in three formats - ERSI files, "DIVA gridfiles", and DBF files

The DIVA gridfiles have extensions .gri and .grd

How can these file types be opened in qGIS? The "Add Raster" menu option does not seem to work