how could i convert the cubemap which i generated from enviorment map to angular map?

I am studing BGE these days
and i want to make fake reflection to my object in the scene
So i need a angular or sphere or L/T map(ALL OF THESE ARE HDR’s format)
so as to i can apply it to my object’s normal or reflection coordinate that i can make fake reflection

Then ,i found a way to make a environment by BLENDER’s environment texture’s function and stored the rendered image to hard disk.

then i open HDR SHOP,try to convert the so called CUBE MAP generated by blender to angular or sphere.
OMG,suddenly i found the so called CUBE MAP generated by blender is not a verticall cross picture

how could i convert it to a angular or sphere format???

please help,thank you very much.