There is only one file type that uses the .NSBVA extension:
Nintendo DS Visibility Animation File
Animation file used by Nintendo DS games, such as New Super Mario Bros.; contains node visibility data that determines what parts of the .NSBMD model appear.
The NSBVA file is used to change the appearance of a character without requiring another model. The file allows the game to toggle between different appearances, such as a character who is or isn't wearing a bandana or shell, at different times throughout the game.
|MKDS Course Modifier||Freeware|
Updated: April 19, 2015