Drag and Drop doesn't work on newer Windows releases

[Tobin Davis]

Drag and Drop doesn't work on Windows Vista/7/8(?) due to User Interface Privilege Isolation (http://blogs.msdn.com/b/patricka/archive/2010/01/28/q-why-doesn-t-drag-and-drop-work-when-my-application-is-running-elevated-a-mandatory-integrity-control-and-uipi.aspx).

Need to add tests for Windows Vista and Windows 7+ and execute ChangeWindowsMessageFilter (Vista) or ChangeWindowMessageFilterEx (7+) accordingly.

[Tobin Davis (gruemaster)]

Ran some extensive tests using ChangeWindowMessageFilter and ChangeWindowMessageFilterEx in separate apps. While I can get the status to change for an area and pass messages from a separate unprivileged app, I cannot get drag and drop to work without having the program launch a separate 'dropzone' applet. This is pretty ugly code and makes for an ugly UI.

Postponing for a bit and dropping the priority.