Files with rco suffix can be usually found on Sony PSP gaming consoles. Resource file that contain system information, sounds, icons, and other theme graphics.
RCO file extension - Sony PlayStation Portable PSP resource file
What is rco file? How to open rco files?
File extension rco seems to be mainly related to a special resource format used on Sony PSP gaming console. A .rco file contains PSP resources, such as system information, sounds, icons, and other theme graphics.