RAR

File Format
Name	RAR
Ontology	Electronic File Formats Archiving RAR
Extension(s)	.rar
MIME Type(s)	application/x-rar-compressed
PRONOM	x-fmt/264

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."

Links

• Wikipedia article
• WinRAR website
• Free UnRAR.dll
• UnRAR source
• Forensics Wiki article (has lots of format details)