.ROCK File Extension
File TypeRockbox Plug-in
What is a ROCK file?
Plug-in file used by Rockbox, an open source firmware for portable music players; stores a game or another small application that can run on Rockbox; enables Rockbox "apps" to be used on iPods, SanDisk MP3 players, and other portable music players.
NOTE: The Rockbox firmware is installed using the Rockbox Utility, a desktop application for Mac, Windows, and Linux platforms.