fix ENCODING_ERR for applicationDirectory

 This closes #193
diff --git a/src/windows/FileProxy.js b/src/windows/FileProxy.js
index c342a56..64ee1df 100644
--- a/src/windows/FileProxy.js
+++ b/src/windows/FileProxy.js
@@ -200,6 +200,12 @@
                 nativeURL: 'ms-appdata:///temp',
                 winpath: nativePathToCordova(Windows.Storage.ApplicationData.current.temporaryFolder.path)
             })),
+            'application':
+            Object.freeze(new WinFS('application', { 
+                name: 'application', 
+                nativeURL: 'ms-appx:///',
+                winpath: nativePathToCordova(Windows.ApplicationModel.Package.current.installedLocation.path)
+            })),
             'root':
             Object.freeze(new WinFS('root', { 
                 name: 'root', 
@@ -249,7 +255,7 @@
         }
     }
     
-    ['file://','ms-appdata:///','cdvfile://localhost/'].every(function(p) {
+    ['file://','ms-appdata:///','ms-appx://','cdvfile://localhost/'].every(function(p) {
         if (path.indexOf(p)!==0)
             return true;
         var thirdSlash = path.indexOf("/", p.length);