Hello guys I will show how create a 3dsmax 3d open window model tutorial.
I have used following techniques shown below in this 3ds max tutorial.
[1]-Click on the box button and create box with the following size
Place like me 
[2]-Create one box and palce like this 
[3]-Create other boxes with the following size and now place like me 
[4]-Create more boxes and place like this 
[5]-I think your object should like this 
[6]-Create plane and box and palce like me 
[7]-Select the plane and boolean the box like me 
[8]-Set the window like me 
[9]-Set the plane like this 
[10]-Press 8 now you will see enviroment window is open
Now put the map in the enviroment map 
[11]-This is my material window and create materials like me 
[12]-Set the skylight like this with the following parameter 
[13]-This is final image of open window
Enjoy thanks for watching 