How do you share a project when only 1 person has ReShaper

A friend and I are working on a VS 2010 solution together.  He makes changes emails it to me, and vice versa.  I have ReSharper and he doesnt.  I've noticed that a new folder got added with _ReSharper got added to the root folder.  When he compiles with this new folder, he gets a whole slew of ReSharper warnings but otherwise its ok.  Since he doesnt have ReSharper, can he just remove that folder from the root directory?

J