(1) TexImg

TexImgHeader	u32	tex_img_tag
	u32	this_tex_img_index
	u32	tex_img_header_size
	u32	tex_img_size
	u32	nintendo_extension_block_size
	u32	user_extension_block_size
	TexImgData
NintendoExtensionBlock	u32	mipmap_max_level
	u32	mipmap_img_offset(0)
	...
	u32	mipmap_img_offset(mipmap_max_level - 1)
	UserExtensionBlock

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