The .rar extension indicates a compressed file created with WinRAR.
Could you tell me or what series/software it is supposed to be associated with? Vol 3&4.rar
Scan the file with a trusted antivirus like Microsoft Defender or Malwarebytes . Vol 3&4.rar
To view the contents, you must use an extraction tool like WinRAR or 7-Zip . Vol 3&4.rar
Compressed chapters or volumes of a series.