Wii U Texture
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What is a GTX file?
A GTX file is a texture included in a Wii U video game. It is used to skin a 3D model. GTX files cannot be opened, but can be converted to the .DDS format.
Textures are game assets used to skin 3D models, so they appear with the correct colors and textures. For example, a texture might be used to apply the correct color and texture to a character's skin or clothing.
Many Wii U games use textures saved as GTX files. For example, Mario Kart 8 uses GTX textures. GTX files are often paired with accompanying .GSH shader files.
NOTE: GTX stands for GX2 TeXture.
How to open a GTX file
GTX files are not meant to be opened by players. However, you can use the player-created GTX Extractor application to convert GTX files to .DDS files, and vice versa.
How to convert a GTX file
You can use GTX Extractor (multiplatform) to convert GTX files to the .DDS format. You can then open the converted file in any image viewer or editor that supports the DDS format.