C# - Sending Fax Using Windows Fax Server Extentions - Faxcomexlib

I'm trying to find faxcomexlib.dll. After Googling around, I installed the Core SDK from the Platform SDK, but I still don't see this dll listed in the System32 folder. This is the code I'm trying to run:

FAXCOMEXLib.FaxServer faxServer = new FAXCOMEXLib.FaxServerClass();
//faxServer.Connect(Environment.MachineName);
faxServer.Connect("//My-Server");
FAXCOMLib.FaxDoc faxDoc = (FAXCOMEXLib.FaxDoc)faxServer.CreateDocument(FileName);
faxDoc.RecipientName = "Test";
faxDoc.FaxNumber = "1234567890";
faxDoc.DisplayName = "Test";
int Response = faxDoc.Send();
faxServer.Disconnect();