Could you provide more detail on or what you expect it to be ? Knowing the source would help me give you a much more specific answer.
Only open the file if you trust the person or website that provided it. 644_RP.rar
Compressed archives can hide malware or viruses that only become active once extracted. Always run a scan using tools like Avast or Windows Defender before opening the contents. Could you provide more detail on or what you expect it to be