OBJ Transform faces from quad to triangles

[caraie]

Hello, i'm new in this forum. I have a question, maybe someone can help me.
I have a OBJ with faces defined in this way (4vertices):
f 1400/1704/10324 1417/1705/10352 1451/1749/10400 1447/1744/10394
f 1387/1665/10301 1363/1638/10247 1452/1750/10402 1449/1747/10396
.
.

I need this OBJ file only with three vertices:
f 1400/1704/10324 1417/1705/10352 1451/1749/10400
.
.
You know if with blender, maya, 3dmax or something i can transform the obj fie in this way?
Thanks a lot!!

[poopipe]

in max

use a turn to poly modifier and limit the maximum edges per face to 3.

also, the obj exporter in max can triangulate at export iirc