Step #2 in the Total Overhaul: Weaponry list
Featured In Mod Lists:
Total Overhaul (#212), Graphics Overhaul (#166), Legacy Graphics Overhaul (#110), Legacy Total Overhaul (#119)
This mod replaces Mehrunes' Razor with a new lore-friendly model that comes with high resolution textures, as well as optional PBR materials (PBR not yet supported by OpenMW).
There is an OpenMW-specific package, download and use that one.