订阅以下载
Umbrella Corporation background

Replace background video with Umbrella Corporation video


Then copy or cut it and replace in the game directories, the game directory can be found at:

X:\Steam\SteamApps\common\Left 4 Dead 2\left4dead2\media


you have to back-up those files and replace the following files:

l4d2_background01
l4d2_background02
l4d2_background03
l4d2_background04
l4d2_background05

the video is not this photo