Be wary of software online claiming to crack RAR passwords; these tools are frequently bundled with malware.
Revisit the website, forum thread, or email where you obtained the file. The password is often listed in the body of the post or in the user's signature. sc24136-RWv107.rar
Use 7-Zip or WinRAR to "Open Archive" rather than extracting it directly. This lets you see the file tree without placing files on your hard drive. Be wary of software online claiming to crack