Put your custom texture files in the BodyDirt, BodyTat, BodyTex, FaceDirt, FaceTat, FaceTex, and Matsuge 
folders in the 
\AppData\LocalLow\HengokuStudio\HengokuNite
 The custom texture files can be used in the game by placing them in the folders.
CustomTextureSample folder is included in this Folder, for Sample.