0x2000 OFFSET
  1 CCM_SETBKCOLOR
  2 CCM_SETCOLORSCHEME
  3 CCM_GETCOLORSCHEME
  4 CCM_GETDROPTARGET
  5 CCM_SETUNICODEFORMAT
  6 CCM_GETUNICODEFORMAT
0x7 CCM_SETVERSION
0x8 CCM_GETVERSION
0x9 CCM_SETNOTIFYWINDOW
0xb CCM_SETWINDOWTHEME
0xc CCM_DPISCALE
