: Use a utility like WinRAR or 7-Zip . Right-click on "part1" and select "Extract Here"; the software will automatically pull data from part2 and any subsequent parts to reconstruct the original file.
: This is the second segment of a multi-part RAR archive. How to Use This File sc25166-SOTFv32355.part2.rar
The file appears to be a specific compressed archive part, likely associated with a digital download for a software application or a video game update. Based on the naming convention, File Breakdown : Use a utility like WinRAR or 7-Zip