L4D2 Level Design/Add-on Notes
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This summarizes the changes for Left 4 Dead 2 Add-ons.
AppID
The addoninfo.txt file in your L4D2 add-on must have the proper app ID:
addonSteamAppID 550
If this isn't included, or if it's set to the Left 4 Dead 1 ID (500), vpk files will not install themselves properly when users double click on them.
VPK install
If users double click a .VPK while the game is not running, it gets copied to a temporary location under
Steam\steamapps\SourceMods\addons
When L4D1 and L4D2 are launched, they look for the addons in those directories and copy them to the correct location in their respective addons folder.