You do not need to extract every part individually. Instead, use a tool like WinRAR, 7-Zip, or The Unarchiver. Right-click on . Select "Extract Here" or "Extract to [Folder Name]" .
Type your description in the window that appears and click . This text will now display whenever someone opens the archive. sc23739-POST3.part3.rar
If any part is missing or corrupted, the extraction will fail. You may need to re-download the specific volume or use a "Recovery Record" if the original creator included one. You do not need to extract every part individually