Open a software like WinRAR or 7-Zip . Right-click only on part1.rar and select "Extract Here".

Downloading split archive files like from third-party repack sites presents significant risks. This specific file name indicates it is the first part of a multi-volume WinRAR archive for a game in the Colin McRae: DiRT series, hosted or re-uploaded by a third-party distributor.

Place part1.rar , part2.rar , etc., into the exact same folder on your computer.

Keep the file names exactly as they were downloaded. Changing them will break the extraction chain.

If you must use third-party files, always upload the .rar or extracted .exe files to VirusTotal to scan them against dozens of antivirus engines before running them.

Repack sites often instruct users to turn off their antivirus software during installation. This is a massive red flag and should generally never be done.

Unlike official platforms, these files do not have digital signatures to prove they have not been tampered with.

You must download associated with the set. If there are 10 parts and you only have 9, the extraction will fail. How to Extract Multi-Volume Archives