This file is a unique file across all courses, but it appears to be a representation of Bowser's Castle prior to compilation into an U8 file. The file was possibly included in the final build of the game by mistake. The file has been of great use to hackers, as it contains meta data describing the format of courses, and revealing much information about the KMP file format. The file appears to have been created 2007/08/30 11:50 by Yabuki Kosuke using a piece of software called JMap. It seems as though this was prior to the development of much of Mario Kart Wii as it seems to describe features from Mario Kart DS. There is another JMap file found in the original Wind Waker (version 1.31 from 2002). The version for this file is 18.104.22.168. Every course (including beta courses) from Mario Kart DS is listed in this file, but no Mario Kart Wii courses are listed here. The model contained in course.0 appears to be an early version of Bowser's Castle. It contains a few things that are not in the final course, including a cannon.