Default should be the green texture, and the one you have labeled as Painted Ground is actual the path texture.
This is what my folder looks like. Note the detailmap.dds file is a grey-scale copy of the default.dds file I believe and is not in this folder for some reason. Look at Lush 2 terrain and see how that one is put together
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.