These are texture files included with Morrowind Visual Pack 3.0 RC 1 that do not have any direct counterparts in the unmodded game, therefore I’m not sure what they’re meant to replace. I am including them here for completion’s sake.
tx_wg_cobblestone_01.dds may have been meant to replace tx_wg_cobblestones_01.dds even though there is also a tx_wg_cobblestones_01.dds included that does actually make this replacement. I don’t know why this is.
File path: Morrowind\Data Files\textures