F_3(04m11s).rar

: If this is a "Proof of Run," the file might contain the video file and a .lss (Livesplit) file.

: Run the file through VirusTotal before opening any executable ( .exe ) files inside. F_3(04m11s).rar

Since the file ends in .rar , it is a compressed archive. You will need a utility to open it: : Use 7-Zip (free/open-source) or WinRAR . : If this is a "Proof of Run,"