Files with the .rc extension contain resource script files used by a number of different software compiling applications. These files contain instructions on how a program should compile the associated application source files.
The .rc file extension is also used for Emacs configuration record files, Mozilla (Netscape) subscription information files and Left 4 Dead files.
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If you have additional information about the RC file format or software that uses files with the RC suffix, please do get in touch - we would love hearing from you.