Hi skipper, Direct3D9 should be built in to Wine, if it's unable to be initialized it probably means that Wine is not recognizing your video card and isn't able to handle hardware accelerated 3D. Installing Direct3D9 separately was only something you had to do for the Windows 2000 OS.

It's probably what was reported here, where your video driver doesn't support 32-bit programs anymore:
http://moi3d.com/forum/index.php?webtag=MOI&msg=8839.1

But you'd only encounter that with MoI v3, not v4. MoI v4 doesn't use Direct3D9 anymore, on Windows it uses Direct3D11 and on Mac or when running on Wine it uses OpenGL.

- Michael