Convert game into Mac

The project is simple, as the title says. I want someone who can take a Windows based game (which was made in 1993 and mostly uses MySQL and PHP) and convert the client to be playable on a Mac OSX. You don't have to code much or make anything new in the game, it simply needs you to download the open source of that game, edit a few files (which i have no clue how to do) and then have it be readable by Mac. It's a 2D online game, with simple functions and codes. As mentioned already, the sources will be available and given to the chosen bidder. Based on how simple I see this project to be, I don't think it'll take so long. Though I'm not such a professional programmer myself, I have made my own game server similar to the coding of that particular game, and it took me about 1 week. I wish I could do this on my own, but I'm unable to program for Mac. P.S: I'll only be accepting bidders who are able to communicate fully and get the point across to me of how they plan to do this. I'll give more details in private message after choosing a bidder, then go ahead with the payments if I get the final confirmation that this CAN be done. P.P.S: As I already said, I'm not a Pro. programmer; therefore, if you find anything missing in order for you to clearly understand the project, please feel free to contact me with questions through private message. NOTE: IF YOU THINK YOU CAN DO THIS, YET YOU CAN'T BID DUE TO MY BAD CHOICE OF "SKILLS" PLEASE LET ME KNOW! Thanks :)