I dont know how much you know about WINE or definition of the Emulator...
Its just a program which is emulating WINDOWS so that windows based programs can run under Unix Based Systems. Its not even complete emulator.
Read this :-
"1.4. Is Wine an emulator? There seems to be disagreement.
There is a lot of confusion about this, particularly caused by people getting Wine's name wrong and calling it WINdows Emulator.
When users think of an emulator, they tend to think of things like game console emulators or virtualization software. This is the wrong way to think about Wine - Wine runs Windows applications in essentially the same way Windows does. Wine is just a native Unix substitute for the components of Windows; there is no inherent loss of speed due to "emulation" when using Wine, nor is there a need to open Wine before running your application.
That said, Wine can be thought of as a Windows emulator in much the same way that Windows Vista can be thought of as a Windows XP emulator; both allow you to run the same applications by translating system calls in much the same way. Setting Wine to mimic Windows XP is not much different from setting Vista to launch an application in XP compatibility mode.
There are a few things that makes wine more than just an emulator.
* Sections of Wine can be used on Windows. Some virtual machines use Wine's OpenGL-based implementation of Direct3D on Windows rather than truly emulate 3D hardware.
* Winelib can be used for porting windows application source code to other operating systems that Wine supports to run on any processor - even processes that neither Windows nor the Emulator bit of Wine supports.
"Wine is not just an emulator" would be a more correct name. Thinking of Wine as just an emulator is really forgetting about the other things it is. Wine's "emulator" is really just a binary loader that allows Windows applications to interface with the Wine API replacement.