CommonDialog Hooking Application

I would like to have a Windows application that will hook into the CommonDialog (for Open and Save operations) and allow users to choose between opening/saving to local disks or browsing to an online repository, accessible via a Web Service. The developed application will have the following features: - runs under Windows XP, Vista, 7 and 8 (both 32 and 64 versions); - at start will go in the system tray and will monitor any call to the Common Dialog class, for the Open and Save operations; - should have a Settings screen where one can save the credentials (username, password, URL for the Web Service) and also decide if will run at Windows start up or not; - when the user choose to open/save a file from any standard Windows application the CommonDialog window will be modified to accommodate the new options. When opening a file, the user will be able to: - browse an online repository (folders and documents) according to the originating application filter (ex: *.pdf); - choose a document from this repository; - load the document into the application. When saving a file, the user will be able to: - choose between saving the document as a new one or as an existing one; - for a new document - browse an online repository (folders and documents); - for a new document - see a list of possible document types and the associated metadata; - for a new document - specify the file name and the required metadata; - for a new document - save the file into the repository; - for an existing document - browse an online repository (folders and documents) according to the document name; - for an existing document - save the file into the repository. All the necessary repository related functions are available through a Web Service.