BNTX File

What are BNTX files and how to open them

Are you having problems opening a BNTX file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your BNTX files.

What is a BNTX file?

A .BNTX file is a Super Smash Bros. Ultimate UI Data file.

Super Smash Bros. Ultimate UI Data files store user-interface textures and related metadata used in the game's menus, HUD, and character selection screens. Created by the game (for example during packaging or updates), they bundle together one or more texture images along with names, layout information, lookup tables, and pointers so the game engine can load and display UI elements efficiently under conditions such as different screen resolutions or graphics settings.

These files typically undergo further processing by tools when modding or repacking the game, such as extracting, editing, and re-exporting textures with the same structure so the game can still read them. They are compiled into the game's main archives and then read by the game engine at runtime to fetch texture image data and metadata like texture dimensions, names, mip map levels, compression format, and memory-alignment or swizzling requirements.

Internally this format matches the NintendoWare/nn::gfx "Binary Texture" container format. The beginning of the file shows a file header with "BNTX" at offset 0, followed by a ResTextureContainer section marked "NX " at offset 0x20. Named sections include BRTI (texture info blocks), BRTD (texture data), a string table ("_STR"), a dictionary ("_DIC"), a relocation table ("_RLT"), plus reserves to ensure textures are correctly aligned in GPU memory and pointers are relocated at load time.

How to open BNTX files

Important: Different programs may use files with the BNTX file extension for different purposes, so unless you are sure which format your BNTX file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 24, 2026

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