To view the contents, you typically need third-party software like WinRAR , 7-Zip , or WinZip . Safety Recommendations

RAR files are used to bundle multiple items into a single, smaller file for easier transport.

If the file was downloaded from a public exploit database, it is intended for educational and security testing purposes only. How To Open, Create, and Convert RAR Files - AVG AntiVirus

While "49775" can refer to various technical entities, the most probable context for a file named 49775.rar is a proof-of-concept (PoC) exploit.