Right-click part1.rar and select "Extract Here" (using software like WinRAR, 7-Zip, or The Unarchiver). The software will automatically combine both parts to extract the content.
Ensure you have part1.rar and part2.rar in the same folder. sc24857-FS22v1820.part2.rar
Based on the file naming convention, this appears to be a for a Farming Simulator 22 (FS22) mod or game update. Filename: sc24857-FS22v1820.part2.rar Right-click part1