Bitmap-based environment maps are supported by this plugin, including HDR bitmaps.
Physical Sun and Sky
Max 2017's Physical Sun and Sky is supported.
Cycles Environment is an environment map type included in this plugin. This map allows you to set two different environment maps to be used in your scene: one for lighting and the other for the background.
Functionally, this map is very similar to Mental Ray's Environment/Background Switcher.
Environment - The environment map to be used as the background.
Reflection - The environment map to be used for lighting.