Because the file ends in , it is a compressed volume created by WinRAR or similar archivers. Master RAR Files: Top Compression Solution | Lenovo HK
: Allows users to connect to SSH, RDP, or VNC clients via the browser by dynamically opening ports on the server. BrowserPort.rar
It may also refer to tools like or similar automation suites that "port" browser actions into scripts. Because the file ends in , it is