When you extract part01.rar using software like WinRAR or 7-Zip, the program automatically pulls data from part05 and the other segments to reconstruct the full v0.8 game folder.
Dead Matter is primarily distributed through Steam via keys provided to original Kickstarter/Indiegogo backers.
If this file was obtained from a third-party file-sharing site or "repack" source, it is not an official distribution. Multi-part RAR files from unverified sources are common vectors for malware . It is highly recommended to scan the file with updated antivirus software before attempting extraction.
This is the fifth part of a multi-volume archive. Because the total game size is large, the installer or game files are split into smaller chunks (part01, part02, etc.) to make downloading and sharing more manageable. Technical Context