Spy Mousebuttons with LibUsb

Hello,
have someone any Idea how to spy mousebutton clicks (No, not the normal buttons, one of the extended buttons, my mouse have 7 of them) with LibUsb http://libusb-win32.sourceforge.net/ , maybe with some example code snippets ?

I have only found:
-some Linux code for the "kernel"
-some Dos/command lin based apps.

But i found no trick to use it in a windows application, neither it do nothing or the mouse "hang" because all the data are not pass through the mouse driver.

regards
Peter