how to read *.grd file using opengl

can opengl read the *.grd file ,
who can tell me or give a example code .
thanx very much !

First it might be good to know what OpenGL actually IS. OpenGL just draws things. THAT’S IT! It doesn’t load files, play music, do networking or order chinese food. All OpenGL knows how to do is render pretty pictures from the data you pass to it, and it does this well.