The software at www.51scope.cn/files/setup.rar is a driver utility for generic USB inspection cameras that has been flagged for malicious activity by security analysis platforms. While intended for hardware functionality, the site's poor security and potential malware risks make using safer, native software alternatives highly recommended.
You cannot open .rar files with built-in Windows tools. Use one of these free programs: www51scopecn files setuprar and install the software