Dynamic hair exports as obj, but in the obj file it appears as a line element and not as face, so only can be rendered by engines that can render lines.
My "PropViewer3" is able to render lines and import and export obj with lines, but only does this.
To be able to render dynamic hair with rendering engines that don't support lines you must convert each line to a polygon and you can do this with mine "Hair Converter".
The only problem is that the polygon number of the converted hair can be huge. You can reduce this huge number of polygons in two way or use both.
1- In the hair room reduce the number of segments of the hair. The default value is 20 and you can reduce it to 4. Of course with less segments the hair can degrade and bends less.
You have to experiment the minimun value where the result is still acceptable.
You can also reduce the hair density or the number of hairs.
2- In the hair converter there is an option "reduce" that decrease the number of faces and also can degrade the hair even more.

Depending of what you do you can create a hair with only 4 segments and convert and reduce giving as result a hair with only one face per hair, a great reduction with a realtive low number of faces.
The hair will be very degraded but still can look very good for fur or monsters.

Stupidity also evolves!