"Half-Life: Opposing Force Coop" allows you to experience the epic Opposing Force story and environment with your friends, or with players around the world. Half-Life and Half-Life: Opposing Force on either WON or Steam is required to play. You must also either have an LAN or internet connection.
This is a small Opposing Force Coop v2.0 patch for ONLY those who run Won servers. You install this right after you ran the Opposing Force Coop v2.0 installer. Shortcuts in start menu should now start server without any error messages, and sv_lan 0 is changed to sv_lan 1, which means changed from internet to LAN server.
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