Files named in this specific format (Version numbers + Part X) are common on third-party file-sharing sites and "repack" communities.
To actually use this file, you cannot open it in isolation. You generally need: WW2.Rebuilder.v1.2.1.part4.rar
You right-click Part 1 only and select "Extract Here." The software will automatically pull data from Part 4 and the others to recreate the original game folder. Safety & Source Note Files named in this specific format (Version numbers
You must have every part of the set (e.g., Part 1 through Part 5) in the same folder. WW2.Rebuilder.v1.2.1.part4.rar
If you want the most stable, secure version with automatic updates and cloud saves, it is best to purchase the game through official storefronts like Steam or GOG.