Cannot Open/Run Game after Download in Support Posted August 2, 2020 · Edited August 2, 2020 by MsMnMs Added Screenshot of message and OS info. I just downloaded the Tiberian Sun: Firestorm game from the site and I was so excited to get to play this game again. Then when I went to click on the icon to start playing, I received a notice that the extention 'Game.exe' had been moved or was deleted and I have no way to play this game that I just installed. Can anyone help tell me why? Windows 10 x64 OS.