Yesh.... I'm not sure if that's the reason it's not showing up in evo-x.
But, it certainly wont work without it's own .xbe, copying the xbmp xbe simply wont do.
If you downloaded something which has no default.xbe, then you downloaded the wrong thing, simple as that.
Yes, XBMP has been discontinued for several years, XBMC is really leaps and bounds ahead, when you load it up, i think you'll be blown away by how much more advanced it has become.
Many/Most/All of us have ditched Evo-x as dash in favour of XBMC as dash, many moons ago.