The .rfl file extension is most commonly associated with Reason ReFill Sound Bank files. Reason is a song creation program that provides users with a virtual studio rack and advanced sequencer features. The RFL files often contain samples, song files and patches that are used by the Sound Bank software. These files are compressed to about half of the original size when stored in the RFL file format.
The .rfl file extension is also used for ANSYS files, Guardian database roll-forward files and RISAFloor analysis & design files.
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If you have additional information about the RFL file format or software that uses files with the RFL suffix, please do get in touch - we would love hearing from you.