R91 File Extension
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What is the .R91 file type?
Indexed filename extensions like .r91 are used to denote volumes of multi-part RAR archives. RAR is a proprietary data compression algorithm invented by E.Roshal and implemented by him into a CLI tool, RAR (rar). Its Microsoft Windows GUI version, WinRAR, has developed into a popular all-purpose archive manager. Both RAR and WinRAR can create and process multi-part archives.
A multi-part RAR archive consists of several parts (volumes) of the same size, each volume uniquely identified with an indexed extension, like .r91. The numerical index points out to a volume's position within the archive. Using such extensions (.r00 – .r99) matches the older convention, while the newer approach (default in many archivers) calls for dual extensions, like .part91.rar.
The .r91 file itself is the ninety-third volume of a presumably large multi-part RAR archive (the first part always receives the standard .rar or .exe extension). Files like .r91 are recognized and can be processed by RAR/WinRAR and all RAR-compatible archives. For successful extraction of data from such a multi-volume archive, all its parts (.r91 and prior) must be available.
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