I'm trying to open files from an Audio CD:

1. The CD is a DTS format Audio CD.
2. The CD is mounted through Daemon Tools.
3. The .cda files can be played in WMP (with aid of AC3Filter).
4. I have installed foo_spdif.
5. .cda files are associated with Foobar2000.

Now, when I try to open the .cda files in Foobar2000, nothing happens. I see the small loading window (or whatever it is) flicker, but then nothing happens, the file isn't even added to the list in the main window.
I can't open the whole Audio CD either, if I try to open it, all the buttons in the Open Audio CD dialog are greyed out (<unknown device> is appended after the mounted cd drive letter).

I don't know what to make of it. Any ideas?

.cda files are not audio files.

I am trying to play and Audio CD, as I said in the post. I know .cda files are not audio files.
However, foobar200 associates .cda files, so one would assume it can play the tracks no?