AFAIK, Ctrl+Mouse wheel is a system wide setting for zoom in apps that
support it.
If Jim's suggestion does not solve your issue, then I guess you could
sub-class the Excel app and check for the appropriate messages.
Not for the faint-hearted, but check out this if it is important:
http://www.cpearson.com/excel/SubclassingWithSSubTmr6.htm
NickHK
Thanks Jim but I don't want to disable more than the mouse zooming.
Thanks for the link Nick, I'll check that out, though it does look
daunting.
Gee whiz, I actually thought I would find a setting somewhere in Excel
(I know it is Office wide, but you'd think individual apps could
disable it for themselves.)
I have a user that is annoyed by it b/c when selecting down pages she
uses the scroll wheel (go figure).
ah well, thanks for the replies.