Notes about the ROCK file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The ROCK file type is primarily associated with 'Rockbox' by The Rockbox Crew. Rockbox is an open source replacement firmware for MP3 players. It runs on a number of different models.