Open RSRC File
The RSRC file is commonly used by older Mac OS applications (Mac OS 9 and earlier), but also used by some Mac OS X applications.
What is MacOS?
MacOS is an operating system designed by Apple that is installed on all computers created by the Apple Inc. company, and are generally known as Mac.
The operating system is what allows you to perform all the tasks on a computer, such as playing games, listening to music, viewing and editing images, among many other things.
Unlike the Windows operating system that can be used on computers from different manufacturers (HP, Gateway, etc.), macOS is designed specifically for computers made by Apple.
This means there is no third-party or OEM manufacturing for Mac, and it also means that the hardware and software will be always fully compatible, so the computer performs better and can process information faster.
RSRC file is a proprietary format file and contains a data library and can include images, icons and custom data and is also used by Mac OS X to store system themes.
The RSRC file is not intended to be manually opened or edited by the user, doing so may cause damage to the system.