You generally need software like WinRAR , 7-Zip , or The Unarchiver to extract the contents.
In legal records from the United States District Court for the Southern District of Florida, the string appears frequently as part of a case number, such as in F.D.I.C. v. Pharaon . Case Number: 1:19-cv-21550. 21550.rar
A file named 21550.rar would typically be an archive containing exhibits, transcripts, or evidence related to this specific court docket. General Characteristics of .rar Files You generally need software like WinRAR , 7-Zip