What do I do with the _s image files?

[iarch]

I have bought arroway textures and they have come with bump maps, and specular maps with _s name extensions. How can I use them in Vray? I'm using 1.49.01

[valerostudio]

I put them in the M under Perpendicular in Fresnel Reflection. The S is a specular map and tells the material what parts reflect less/more than others. Example, a tile's grout would not reflect much at all, if any, so the grout lines would be almost black.
Arrowway rocks BTW - good investment!