Fix compiler error on native windows (std::string instead of bfs::path for detection of windows 3-letter filename extensions).
Fix compiler error on native windows (std::string instead of bfs::path for
detection of windows 3-letter filename extensions).



git-svn-id: d5469d78598a82f75b3d1e6419ce8b4d1ddac974@2789 aa0779c3-6ec2-4b84-a212-a405c134cd8d

pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA