windows api commands on mac excel 2011

Hi,

I have a new project I have almost finished, however during testing I tried it on a mac as some of my users have mac's. Some of my code has windows API in it, such as for creating folders and calling word and pinging the mail server.

Basically it doesn't work on a mac and I'm guessing it is because of the API stuff, is there any way to get it to work on a mac?