Here is a list of all documented files with brief descriptions:

animation.h
button.h
combobox.h
common.h	This file includes macro definitions and typedefs that commonly used by MiniGUI
control.h	This file includes interfaces of standard controls of MiniGUI
coolbar.h
ctrlhelper.h
customial.h	This file is the head file for Custom IAL Engine
edit.h
endianrw.h	This file includes functions for reading and writing data from general sources, such as file, memory, etc., and also includes functions for reading and writing endian-specific values
exstubs.h	This file is the header for NEWGAL/IAL engines which should be implemented by an external module
fixedmath.h	This file includes fixed point and three-dimension math routines
gdi.h	This file includes graphics device interfaces (GDI) of MiniGUI
gridview.h
iconview.h
listbox.h
listview.h
menubutton.h
minigui.h	This file includes global and miscellaneous interfaces of MiniGUI
monthcal.h
newtoolbar.h
progressbar.h
propsheet.h
scrollbar.h
scrollview.h
spinbox.h
static.h
textedit.h
trackbar.h
treeview.h
window.h	This file includes windowing interfaces of MiniGUI
xvfb.h	This file includes global and miscellaneous interfaces of xVFB for MiniGUI