Who is the real Flash

The rf file extension is associated with the RealFlash clip file format.

Flash clip file created by RealSystem applications, optimized for RealNetworks applications.

Audio or video encoded to RealAudio and RealVideo formats. This file is created with RealEncoder or RealPublisher and delivered by the RealServer streaming media server.

The rf files can contain multiple streams, including audio, video, image maps, and events. Video files can contain audio and video or video only and can be played with RealPlayer. Audio only files can be played by RealPlayer and Real Audio Player.

MIME types:
image/vnd.rn-realflash

This rf file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.