Transparent models

When I render models they appear to be transparent on one side. It is very big problem for me because I port models to “Men of War” game and once they are ported they have the same problem and I have to use 3ds max 2009 because plugin for “Men of War” is only created for it. And I only have that problem with few models. I tried opening models that have that problem in blender to see if there is some problem with models but they work great. I tried exporting models from blender in different formats but problem still appears.

Is there some way that 3ds max can fix this? Maybe some other program?