.NSBTX files are texture files that can be applied to a Nintendo DS model (.NSBMD file). .NSBTX files contain textures saved in a bitmap image format (BMP) and can be mapped onto a 3D model to manipulate the appearance of the model. These files generally contain a single texture that is to be applied to one or more models for us in a DS application or game.

.NSBTX can be easily viewed from within the 'Windows NSBMD Tool' application.