This project is basically an imported version of GNU-whois command-line tool(whois 4.7.24).The main part is unchanged, except the socket APIs and some posix functions. All the "adaptor" functions are in the win_funcs.c file.
You did a great job there! I was actually looking for a whois lookup website/ downloadable tool that can return results of domains with different tld. I needed to parse the results for the owner/registrant organization. After trying different tools, i have to say there is no other tool out there that gives me the results as complete as yours. Thanks!