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Failed to load the launcher DLL

I see the error "Failed to load the launcher DLL: The specified procedure could not be found" when launching a game through Steam.  What can I do?

Note for Dota 2, Portal 2, and Alien Swarm users:

If you are seeing a similar error when launching Dota 2, Portal 2, or Alien Swarm, make sure your computer's CPU is compatible with SSE 2. CPU testing instructions can be found here. These titles require an SSE 2 compatible CPU. Computers that do not meet this requirement will not be able to play the game.

Before attempting the solution below, verify the game's files and re-test the issue.

If the problem persists, exit Steam and browse to the game's installation folder.

For older Valve games, the folder will be in the following path by default:

C:\Program Files\Steam\steamapps\<account_name>\<game_name>\

Other games can be found in the following path by default:

C:\Program Files\Steam\steamapps\common\game_name\

Once you've located the game's folder, delete the "Bin" subfolder.

Then, launch Steam and test the issue. 


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