-Fix to enable private method Path.CheckInvalidPathChars() to handle Unicode paths;
-Fix to enable private method Path.CheckInvalidPathChars() to handle Unicode paths;

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS02]$/alphafs/Development;C111673

modulexcite/AlphaFS,thomaslevesque/AlphaFS,alphaleonis/AlphaFS