Spambayes copy the buttons to the clipboard

Hello,
(I think I post this before, but I can't find it.)

I use a clipboard manager
(http://gallery.live.com/liveItemDetail.aspx?li=0f6a9526-97aa-4b6f-9b24-95b193c158d4)
for Windows that allow multiple entries in the windows clipboard.
This clipboard manager allow text and graphic.

It's not really a bug, it's more a strange thing,
but each Outlook start I found the graphic from the both ;) :)buttons
in the clipboard.
Is there any reason for this behavior?

Peter