It would be super dope if you could post a MouseWheelXtra.cpio file so that mac projectors that use the xtra could be generated on Windows. Or is there already another way to add the xtra to a Director project on Windows that I am too stupid to realize?

My thinking is that with a cpio I could then add a line to xtrainfo.txt that says

[#namePPC:"MouseWheelXtra", #nameW32:"WheelMouse.x32"]

Very good idea !
Done. If you redownload the version 1.4 it contains the .cpio (and the .data and .rsrc) files, for crossplatform development.
Enjoy !

Excellent! Thanks and happy new year!