How are windows import library created

[kiskami]

Hi, im no expert in this, but my workflow used to be the 
following:
Windows (vc) lib conversion to a dmd linkable one:
1. def file generation, from windows lib: coffimplib.exe -e 
ecl.lib
2. edit def file for the missing symbols, for ex: _SDL_Init = 
SDL_Init ==> _SDL_Init at 4 = SDL_Init
3. update lib: implib.exe SDL.lib SDL.def

In a recent project I only needed the 1. and 3. points, and to 
use extern (C), because the def file was ok!