The software will automatically pull data from part05 and all other segments to recreate the full installer or game folder.
Use software like WinRAR or 7-Zip to open only the first part (usually .part01.rar ). sc23018-DOS2DEv361173735.part05.rar
The file is a specific part of a multi-volume archive containing the game Divinity: Original Sin 2 - Definitive Edition , specifically version 3.6.117.3735 . Understanding the Archive The software will automatically pull data from part05