The .rb file extension is used for software applications that have been written in the Ruby programming language. Ruby is an object-oriented scripting language. It was created by blending a variety of other programming languages including Perl, Smalltalk, Lisp, Eiffel and Ada.
The .rb file extension is also used for Fuzzy rule based definition files, REALbasic project files, RocketEdition eBook files, Rosebud configuration profile files and Ruby on Rails class files.
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If you have additional information about the RB file format or software that uses files with the RB suffix, please do get in touch - we would love hearing from you.