OpenGL doesn't work on Intel HD Graphic???

[nic727]

Hi,

I have difficulties to run the game in OpenGL mode. It's don't lag or freeze, the game run very smoot on my Intel HD graphics, but I have strange problem...
watch the picture there, http://communities.intel.com/thread/27375?tstart=60

I have strange cloud and when I put hardwareshader=1, it's not possible to have Perfect setting. + the ground in OpenGL has pixel flash when I'm at low altitude, but I have strange flash at high just for the forest.

My questions are simple : What OpenGL version I need for this game?

I have OpenGL 2.1

Second questions : Do I have to change the directory of my game?
I install my game in C:\ and I created a folder "Il2 1946" with all the game inside.