It looks like you’ve come across a specific part of a —essentially a large file (likely a game installer) that has been chopped into smaller pieces for easier downloading or sharing.
It significantly improves the compression ratio, making the final file size smaller. Call.of.Duty.Modern.Warfare.part25.rar
Place all numbered parts in the exact same folder on your computer. It looks like you’ve come across a specific
Use a tool like WinRAR or 7-Zip . You only need to right-click on part01.rar and select "Extract Here." The software will automatically "stitch" Part 25 and all other pieces back together into the original full-sized file. Use a tool like WinRAR or 7-Zip
You need part01.rar all the way through to the final part (which could be Part 50, 100, or more depending on the source).
Because this is , it indicates that the total file size is quite large, which is standard for Call of Duty: Modern Warfare . Here is what that file is and what you need to do with it: What is a "Solid" Archive?