Window Definition ('WDEF' ID  * 16 + variation code): 4-byte integer (decimal)
Clr Hi-Lite:  0 = False   -1 = True: 2-byte integer (decimal)
Btn Type:    0 = Solid     1 = Frame    >1 = ????: 2-byte integer (decimal)
PICT ID:: 2-byte integer (decimal)
PICT Horz:: 2-byte integer (decimal)
PICT Vert:   : 2-byte integer (decimal)
reserved: 4-byte integer (hex)
reserved       : 4-byte integer (hex)
Btn Count:: list (2-byte one-based item count)
  RECT of Btn:: rectangle
  reserved: 2-byte integer (hex)
  Btn Message:: pstring (1-byte length) (padded to 2-byte alignment)