Here are the data structures with brief descriptions:

C_ANIMATION
C_ANIMATIONFRAME
C_ARC
C_BITMAP
C_BLOCKHEAP
C_CLIPRECT
C_CLIPRGN
C_CONTAINERINFO
C_COOLBARITEMINFO
C_CTRLDATA
C_DESKTOPOPS
C_DEVFONT
C_DLGTEMPLATE
C_DTFIRSTLINE
C_ETC_S
C_ETCSECTION
C_FONTMETRICS
C_GAL_Color
C_GAL_Palette
C_GAL_Rect
C_GLYPHBITMAP
C_GRIDCELLDATA
C_GRIDCELLDATACHECKBOX
C_GRIDCELLDATAHEADER
C_GRIDCELLDATANUMBER
C_GRIDCELLDATASELECTION
C_GRIDCELLDATATEXT
C_GRIDCELLS
C_GRIDVIEWDATA
C_IME_TARGET_INFO
C_IVITEMINFO
C_LFRDR_TRACKBARINFO
C_LFRDR_WINSTYLEINFO
C_LFSCROLLBARINFO
C_LISTBOXITEMINFO
C_LOGFONT
C_LVCOLUMN
C_LVCUSTOMDRAWFUNCS
C_LVFINDINFO
C_LVITEM
C_LVNM_NORMAL
C_LVSORTDATA
C_LVSUBITEM
C_MAINWINCREATE
C_MCCOLORINFO
C_MENUBUTTONITEM
C_MENUITEMINFO
C_MG_Client
C_MG_Layer
C_MG_RWops
C_MSG
C_MYBITMAP
C_NTBINFO
C_NTBITEMINFO
C_POINT
C_RECT
C_REQUEST
C_RGB
C_SCROLLBARDATA
C_SCROLLINFO
C_SCROLLVIEWITEMINFO
C_SIZE
C_SPININFO
C_STIPPLE
C_svitem_operations
C_SYSTEMTIME
C_TEXTPOSINFO
C_TVITEMINFO
C_WINDOW_ELEMENT_ATTR
C_WINDOW_ELEMENT_RENDERER
C_WINDOWINFO
C_WNDCLASS
C_WORDINFO
C_XVFBEVENT
C_XVFBHeader
C_XVFBKEYDATA
C_XVFBMOUSEDATA
C_XVFBPalEntry
C_ZNODEINFO