How to force use of DirectX8 instead of DirectX9?

Hi,

What is the recommended way not to use Wine's DirectX9 and fall back to DirectX8 instead?
Some applications list DirectX 8.1 as their minimal graphics requirement,
yet they come with DirectX9 on the CD and presumably use Wine's DirectX9.

The author of the screenshot at
http://www.adventure-treff.de/images/bild.php?bild=/features/ankh_grafikverg...
shows how graphics differ a lot for Ankh, depending on whether DirectX 8 or 9
is being used in MS-Windows.

Perhaps forcing use of DirectX8 can help make some applications run? (Or help locate bugs)

Thanks for your help,
    Jörg Höhle