R00 FILES ARE USED BY THE PROGRAM TO MANAGE COMPRESSED WINRAR ARCHIVES. R00 IS THE SECOND PART OF A MULTIPLE FILE ARCHIVE CREATED WITH WINRAR. THE FIRST FILE OF SUCH ARCHIVE HAS EXTENSION OF RAR THEN IS R00, R01, R02, ETC. ALL ITS VOLUMES ARE NECESSARY TO SEPARATE SUCH AN ARCHIVE.

MULTI-PIECE ARCHIVES ALLOW DATA TRANSFER BY A FEW SMALL MEDIA. RAR SUPPORT MANY ADVANCED FEATURES INCLUDING POWERFUL AES-128 ENCRYPTION.