You cannot "open" Part 2 on its own. Ensure Bach_Well-Tempered_I.part1.rar is in the same directory.
The filename suggests a multi-part archive containing recordings or sheet music of Johann Sebastian Bach’s The Well-Tempered Clavier, Book I . Bach_Well-Tempered_I.part2.rar
If you are looking for the creative "content" of what Bach wrote in this section: You cannot "open" Part 2 on its own
Right-click Part 1 and select "Extract Here." The software will automatically bridge the gap into Part 2 to finish the job. Musical Context Bach_Well-Tempered_I.part2.rar