Files with rtsl extension are used by the RealNetworks software.
Software that open rtsl file
RTSL file extension - RealAudio RTSL document file
What is rtsl file? How to open rtsl files?
The rtsl file extension is related to RealNetworks, which utilize the IETF standardized Real Time Streaming Protocol (RTSP) but only to manage the connection. The actual audio data is sent with their own proprietary RDT protocol, which they initially kept secret. Recently, some specifications for the RDT protocol have been made public through the Helix Community project. The open-source MPlayer project eventually developed a means of playing the RDT streams.
MIME: application/x-rtsl Mime: application/x-rtsp
List of recommended software applications associated to the .rtsl file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open rtsl file, edit rtsl file, convert rtsl file, view rtsl file, play rtsl file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with rtsl file - RealAudio RTSL document file
Click on the software link for more information about RealPlayer. RealPlayer uses rtsl file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).