Chng.BAT

The Chng.BAT is an internal program that Yuichiro Hikari installs into MegaMan.EXE in MegaMan Battle Network 2. This upgrade grants MegaMan the ability of the Style Change. In the game, it had to be retrieved (more like stolen) from the treasure room in Yumland area. It is thought to either have been destroyed or removed after MegaMan's deletion in MegaMan Battle Network 3.

Trivia
Other than the Hub.BAT, the Chng.BAT ".BAT" is the only program known to be running MegaMan's system.

Chng may stand for "Change"