Wine is not an emulator.
That is, it doesn't emulate the bare hardware (the "box"), instead it reimplements the required windows libraries. So, in principle, it can be as fast as native Windows.. I don't know if DX in particular has been reimplemented or if the windows version is used on top of a more low-level interface.

I get that its illegal, but when has that stopped the open source community?

[citation needed] on that being illegal. IANAL, but I wouldn't see why. Also, most of the OSS community, and in particular the free software movement, base all their claims (think open licenses) on legal bases, so I think you have the wrong impression of them.

EDIT: I realized I wasn't being very helful above. If I were you I would try wine. Or the commercialy supported version of it, "CrossOver".

Wine is not an emulator.
That is, it doesn't emulate the bare hardware (the "box"), instead it reimplements the required windows libraries. So, in principle, it can be as fast as native Windows.. I don't know if DX in particular has been reimplemented or if the windows version is used on top of a more low-level interface.

I get that its illegal, but when has that stopped the open source community?

[citation needed] on that being illegal. IANAL, but I wouldn't see why. Also, most of the OSS community, and in particular the free software movement, base all their claims (think open licenses) on legal bases, so I think you have the wrong impression of them.