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.R File Extension


File Type 1 Right Audio Channel File  (Most common)
File Format File
Common? No
File Description Audio file containing the right channel of an audio track; often exported by audio production programs, such as Digital Performer (Mac) and Cubase (Mac and Windows).
Program(s) that open r files Mac / Windows: Apple iTunes or other music player

File Type 2 R Script File
File Format Standard File
Common? No
File Description Script written in R, a programming language designed for statistical computing and graphics purposes; contains code that can be executed within the R software environment.

The R Project is developed and maintained by The R Foundation for Statistical Computing.
Program(s) that open r files Mac / Windows / Unix: The R Project for Statistical Computing

File Type 3 Mac OS X Resource File
File Format Proprietary File
Common? No
File Description Resource file that may be referenced by one or more programs in Mac OS X; typically contains variable definitions and short functions; may also reference other resource files.

R files in Mac OS X are similar to .RSRC files used in Mac OS Classic.
Program(s) that open r files Mac: Referenced by various programs; Editable with a text editor

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/r