There is only one file type that uses the .NSCR extension:
Nintendo DS Title Screen File
File used by Nintendo DS games such as Mario Kart DS; specifies how image tiles stored in an .NCGR file are arranged to makeup the title screen graphic for the game; stores location and rotation data for each tile.
Title screen graphics can be edited with MKDS Course Modifier and Crystal Tile 2.
Updated: March 4, 2012