Files that contain the .par2 file extension are Parity Archive volume files. PAR2 files are created by the Parchive file archiving software when a user creates a backup of the information on his or her hard drive.
PAR2 files are used for data archive recovery purposes. When a volume in a multi-part archive is lost, the .par2 file can be used to recover the missing data.
The .par file extension is the file extension that is given to the files that are created with the first version of the Parchive software. The .par2 file extension is assigned to the files that are created with the second generation of the software.
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