Suppose you download 9 of the 10 RAR’s from a binary newsgroup that contain a video file, and you can’t find the 10th. PAR2 files are able to magically fix, and even re-create missing files. It is not a bad idea to download the PAR’s to make sure that your files are OK. For example, there could be small flaws in a video that you can’t find unless you watch the whole thing very closely. Of course, it is not always obvious if a file is damaged. So, you don’t need to download PAR files unless you need them to fix a damaged file in your possession. The poster did that as a favor to somebody who needed to fix a file that he had downloaded previously. Sometimes in a newsgroup you will see a set of PAR’s posted with no other files. You don’t decompress them like you do RAR files. PAR2 files don’t have a separate life of their own. PAR2 files work on both Windows and Mac, and can be used to protect any kind of file. PAR2 files contain error-correction data that can be used to fix files that become corrupted during the upload/download process on Usenet where there is no built-in error correction.
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