Hi Ted,
There's a utility on source forge
www.sourceforge.net called ScanCDP
http://sourceforge.net/projects/trainz-scancdp/?source=directory
This runs from a command prompt and lists the contents of a CDP file. You can't extract a single item from it though as the data extraction is still done through Content Manager, but at least you can view the contents.
If you want to save a listing, you could always pip the output from the screen to a text file using the > character after the file name and point that to a text file.
Like this:
scancdp THIS.CDP > Mylist.txt
John