Drag ANY type of file onto the Tree and be able to OPEN with a double click

I would love to use this to quickly access files that may be associated with more than one project, but these are Word, Excel, soundbites, videos, PowerPoints, images... If I could just drag the file onto the tree and view a thumbnail of it like Windows Explorer allows, that's all I would need. Limiting this to self-created files makes this program useless to a huge potential market for the product.