I agree with what Mudbill said.
Bare in mind that if Launcher.exe is not located in your mod's folder (which it's obviously not), you need to go up a directory.
You could do that by adding "..\" to the location, though I prefer pushing the working directory before executing the code itself...
I would do something like this:
pushd ..\
Launcher.exe "Amnesia Dark Horror\DH_config\main_init.cfg"
Also... another tip... Don't launch it as an administrator.
The default directory for that is the System32 folder.
You do have rights to launch applications.