CoCreateInstance COM function to test the Class Factory interfaces.
- Create IDirectSound and IDirectSound8 objects using CreateDirectSound
  and CreateDirectSound8 using a NULL device GUID.

Implement MessageBox-based RestartDialog() and RestartDialogEx(), use
string resources for ExitWindowsDialog() to allow
internationalization.

Refcount all objects, and use pointers internally.

Write the encoded GUIDs for product registration in the Installer
registry.

instead of a HANDLE.

  non-control scrollbar resulted in the scrollbar being drawn over the
  whole window area.
- If you don't set WS_HSCROLL/WS_VSCROLL on window creation, setting a scroll
  range does nothing. Setting the scroll range to a non-zero range should cause
  scroll bars to be displayed. Setting the range to a zero range
  should cause the relevant scroll bar to be hidden.

XA_STRING.

Use the client window as drawable when possible.

VxD on NT, add a test case.

on shutdown.