Originally posted by: Nik
WinRAR takes a file (700MB) and breaks it up. Right-click on each individual (one of the 48 parts) file and go to properties. You'll see that the file itself is not 700MB. Each file should be ~14.5MB. The 700 that you see is what the resulting .sfv file will be when WinRAR is finished extracting all 48 pieces and combining them back together into the original file that was compressed and split.
Just open the first one (or there may be an non-numbered rar file in the list) and have WinRAR extract it. WinRAR will extract the contents of the first file, then automatically open/extract the contents of the second file, and so on until the original .sfv file has been restored.