DirectX in Wine
 

The implementation of Direct X in Wine, does that mean that DirectX is in Wine or it can be installed into Wine ??

It means it is (mostly) in wine. Wine's version of directx still has quite a few problems with direct draw, but direct 3d works quite well.

Also, you can use some of Microsoft's .dlls in wine. You just tell wine to use Microsoft's instead of its own. That can sometimes cause problems though.

I tried installing directx in wine once. It wasn't a success at all.

Current status of the wine own's DirectX implementation:

http://www.winehq.org/site/status_directx

You might or might not have some luck installing DirectX (the real one) under wine. But regardless of how the installation goes, wine will not use it, simply because it can't. At most, wine can use some dll's, some pieces. But nothing else.

If there's no reason to do the other thing, you should always use the wine implementation of the directx apis. If you are trying to run some program, look into the wine database, because most likely, someone already tried, and in that case, you might find useful comments there from other users explaining if some manual tweaking was needed to add windows native dlls or something.