These files are usually for the DX version of the game.

Use a file archiver like 7-Zip or WinRAR to extract the files.

Right-click only the first file ( ...part01.rar ) and select "Extract Here." The software will automatically combine all subsequent parts.

You must have all parts of the archive (e.g., part01, part02, part03) in the same folder.

Always scan downloaded files from unknown sources with reputable antivirus software.