DDS Files

The DDS Format from Shenmue (at least 1) is a Nvidia texture tools based DXT1 https://github.com/castano/nvidia-texture-tools

But the game will also work with normal DXT1 DDS files The game ignores hash checks? Passthrough of all hash references and unknown values is pretty fine, the game seems to eat those without problems my guess is that the hashes are just for reference for the executeable to know what file is needed or the validation warnings are just simply ignored by code