I have downloaded 3 modeling programs, Wings3d, MilkShape3d, and gmax. I designed my models in gmax then got a .md3 export plugin for it. I imported my model into MilkShape3d as a md3 file, but my MilkShape expired

. Is there another program I can dl to get my .md3 (or P3D or .gmax) file to a Wavefront .OBJ? I'd rather do it in a way that I DON'T have to register.
Thanks,
Doctor