Building Windows-based WYSIWYG Editor..?? URGENT Query

Hi...

I hav a task assigned to build a windows-based WYSIWYG EDITOR with all the advanced options such as inserting text,images,
audio files(mp3,wav), video files(mpg,avi), flash files(swf) as content and it should also support layering of objects(ie., free positioning of objects within the layout ....like drag and drop of individual objects into any portion with in layout).

I too had a good look at "Building WYSIWYG Html editor" article written by Mitchell Harper in this site. But.....am a bit confused at how can i do this in a windows-based application.

Im expecting a detailed reply of how can i proceed with this task?........i too expect a reply with code examples...

pls help me out here....this is an URGENT requirement......

thanx in advance.....

thanx again.....saran