application/x-rar-compressed

This mimetype is deprecated. You should still support it, but avoid using it to assign new mimetypes.
Instead, please use application/vnd.rar

Roshal ARchive (RAR) is a proprietary file format used by the compression software WinRAR. They make the decompression code available for use in other programs and allow its distribution, but with a license provision that "You cannot use the unrar source to re-create the RAR compression algorithm, which is proprietary.

File types

.rar

Also appears as

Further reading

  1. Internet Assigned Numbers Authority (IANA)
  2. Let's Solve the File Format Problem!