Steam actually has a built-in feature for games to upload manuals, where they get a dedicated link[1]. Hardly any games bother though. [1]In the current versio

Steam actually has a built-in feature for games to upload manuals, where they get a dedicated link[1]. Hardly any games bother though. [1]In the current version of Steam, if there is a manual, it's at: Right click the game->Properties->General tab.