Accessing the Entrechment content

I just bought the sins of a solar empire bundle and sins plays fine, but I was wondering, is the entrechment content available from the base install or do I have to run the entrechment from my impulse games list to use it? If so, when I double click on it or select run it tells me "This application has failed to start because fmod.dll was not found. Re-installing the application may fix this problem." Should I disregard and just play from the regular sins of a solar empire?

Thanks in advance and thanks for reading