custom fake dll

[Ilya Basin]

Hi. Is it possible to make a custom dll that wraps some native linux
API? Will a newer version of Wine be able to load a fake dll built for
older release?

Is it necessary to create a new directory under dlls/ and update
configure scripts? Or I can use Wine's Makefile to build in a separate
directory, just like when you make custom kernel modules on linux?

Why every dll/exe that comes with wine is fake and real code is
located in the corresponding *.so file? Even those depending only on
other dlls, like regedit.exe or msvcrt.dll. Only to speed-up
wineprefix creation?