I checked this and I see that there is an error with:
HandMorph>>#generateKeyboardEvent:
in this piece of code:
(type = #keystroke and: [(buttons anyMask: 16)
and: [charCode = 30 or: [charCode = 31]]])
ifTrue: [^MouseWheelEvent new
setType: #mouseWheel
position: lastMouseEvent cursorPoint
direction: (charCode = 30 ifTrue: [#up] ifFalse: [#down])
buttons: buttons
hand: self
stamp: stamp].
The value for charCode is 0, that is the reason why MouseWheelEvent does not work in Roassal2 in Windows.
Instead of MouseWheelEvent the KeyboardEvent is used.
Note: keyvalue has the value 31.
Maybe there is and error with Sensor class in Windows
Cheers,
Milton