Rich Interactive Deskop Application

Hi

I want to create rich desktop content authoring tool in .net similar to "articulate storyline" (http://www.articulate.com/products/storyline-top-features.php)

It will have feature like
• creating content by selecting templates/slide
• Editor toolbar
• Apply themes for all templates/slide
• Drag and drop interaction
• MultiMedia support - Add flash interaction ,import video,audio,image.
• Animation and transition - Apply animation to image, Add transition effect on slide   
• adding images, characters and import from other source such as powerpoint.

• adding triggers on image, character, button (e.g on click on image show next slide)
• Integration of audio/video files,
• Screen recording capture to video and editing functionality etc .
• Publish content to HTML5

I need your suggestion on below points:
- Is WPF along with expression blend required to build this kind of content authoring tool?
- If you could throw light on what would be architecture of this kind of intuitive and interactive application.
- Also we would using file based structure to store content e.g template, image, animation properties and mapping(We will not be using any database)

Please provide your input. Thanks