Embedding a binary file inside a class library

Yes it is easy:

Add the file to your project and set the "Build action" to "Embedded resource".

In your program do

foreach (string name in Assembly.GetExecutingAssembly().GetManifestResourceNames())
{
  if (name.EndsWith("<name>", StringComparison.InvariantCultureIgnoreCase))
  {
    using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(name))
    {
      // ...
    }
    break;
  }
}

Finding the right resource is a little bit complicating because there is stuff in front of the file name (namespaces etc. set a breakpoint to the if(...) to see the real resource name).