The .rnx file extension is most commonly used for RealPlayer settings files. These files are created by the RealPlayer media playback application. The RNX files contain the settings defined by a user, such as presets and favorites. These files can be shared with other RealPlayer users to share the user's preset and favorites information.
The .rnx file extension is also sometimes used for audio files that are played with the RealPlayer application.
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If you have additional information about the RNX file format or software that uses files with the RNX suffix, please do get in touch - we would love hearing from you.