There's a few ways; my preferred is the "stab in the dark" method.
Mostly you can simply open up MS Word and find the Visual Basic for Applications editor. Find the "Object browser" and you can find a list of all COM Objects bundled with your project. You can include external components and expose their data too. Its great coz it also covers all of the methods, functions and the like.
I don't know of any standalone applications that do this.
Wandering into the windows registery editor can yield some useful information; exposing CLSIDs (not used in mIRC at least) and the like.
