Let's see if I can completely strike-out, with a third unanswered post:

I would like to know how to store binary data in the app.config file for a C# application.

These are basically text strings, but they do include one or two "binary" characters, such as decimal 12.

I need these strings in my application, but would like to store them in the app.config file and get them with ConfigurationSettings.AppSettings.Get().

Are you wanting to store it as

What I'm asking is, by binary data, are you wanting to write is as binary, or just write it, or write it using something like a binarywriter? If I figure that out, I bet I could help you ;)