.RCO File Extension
PlayStation Portable Resource File
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What is an RCO file?
File used by the PlayStation Portable (PSP), a gaming device developed by Sony; contains resources for the PSP, including system information, sounds, icons, and other theme graphics; commonly used to customize the look and feel of the PSP interface.
One commonly edited RCO file is topmenu_plugin.rco, which contains the main menu and submenu XMB icons and text. RCO files are located in the flash0:/vsh/resource directory on a PSP flash card.