当我通过 Steam 启动游戏时，我看到错误“无法启动游戏（缺少可执行文件）”。
steam 帮助告诉我这样做：
Completely exit Steam.
Navigate to your Steam installation folder (~C:\Program Files\Steam).
Delete the 'appcache' folder.
Restart your computer and attempt to launch the game through Steam.
但我找不到该文件夹。我使用 ubuntu 12.04，有谁能帮忙吗？