For testing and designing new include files, results from \Masm32\Examples\*.asm:
118 RECT
088 WNDCLASSEX
087 MSG
071 PAINTSTRUCT
032 TBBUTTON
032 TBADDBITMAP
029 INITCOMMONCONTROLSEX
024 OPENFILENAME
017 POINT
013 MSGBOXPARAMS
010 CHARRANGE
007 OFSTRUCT
007 LV_ITEM
007 LOGBRUSH
007 DWORDDWORD
006 EDITSTREAM
005 WIN32_FIND_DATA
005 FILETIME
004 SYSTEMTIME
004 NMHDR
003 REBARBANDINFO
003 LV_COLUMN
003 LOGFONT
003 FINDTEXT
002 TOOLINFOW
002 TBarSUB
002 SHFILEINFO
002 PRINTDLG
002 PAINTSTRUCT, hDC
002 PAGESETUPDLG
002 NOTIFYICONDATA
002 MCI_OPEN_PARMS
002 MCI_PLAY_PARMS
002 GdiplusStartupInput
002 BROWSEINFO
002 BITMAP
Interesting that rect gains of wndclass.
Would be nice if do these comparisions with messages 'WM_' and functions too.