The .r00 file extension is affiliated with .RAR file types, which are compressed file archives. There should be more files, like .r00, .r01, .r02 these are parts of the archive. They are broken into parts in the situation that you need a large file broken into separate smaller ones.For example, You need to move a 1GB (1000MB) file and your only means is two CDs that can hold 700MB each. You can archive the file and split it so that there are two archives that each consist of 500MB. This way you can transport the files easier.The most common method to extract these files is to useWinRARWhich you can get from: http://www.rarlab.com/
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