The .rar extension indicates that the file is a compressed archive. You will need a tool like WinRAR or 7-Zip to extract the video file inside.
This is the most common association for the abbreviation "SG" in a sci-fi or television context. The first episode, "Children of the Gods," originally aired in 1997 and follows the flagship team of Stargate Command as they begin exploring the galaxy. SG EP01 -[www.datavilla.in] (1).rar - Google Drive
A common Indian thriller series that matches the likely regional origin of the domain ".in" (India). File Details "Children of the Gods