Windows Help behaves inconsistently in different configurations of CrossOver Mac.
To reproduce these bugs, open any Cardbox database and do Search > Select. When the search box has opened, press F1 (or fn+F1) to open the online help.
Under Windows you will get this:

Under CrossOver Mac, with no additional software installed, you will get this:

(When you try to close this window you will see that there are two identical windows with identical contents, one obscuring the other).
Under CrossOver Mac using a Win98 bottle in which Microsoft Internet Explorer 6 has been installed, you will get this:

Under CrossOver Mac using a Win2000 bottle in which Microsoft Internet Explorer 6 has been installed, you will get this:

Again there are two identical windows, one on top of the other. Quite often closing one of these windows will cause Cardbox to crash with an error reported in hhctrl.ocx, or to disappear without any message at all.