Converting old C++ code to Visual Studio application

Hi all,

I am new to Visual Studio 2013 but have an old C++ project which needs to be converted to run with Windows 7/8 and 32/64bit hardware.

There are some notes with the application which suggest using nmake.exe to build the project via a script (file with the extension .mak)

What is the best way if any to rebuild this project from the C++ source files, I should say that it is a graphic product which includes icons to activate commands to draw simple lines.

Thanks Mike