diff --git a/invesalius/data/mask.py b/invesalius/data/mask.py
index 8b8d681..3f918a0 100644
--- a/invesalius/data/mask.py
+++ b/invesalius/data/mask.py
@@ -45,7 +45,7 @@ class Mask():
             if isinstance(d[key], vtk.vtkImageData):
                 img_name = '%s_%s.vti' % (filename, key)
                 iu.Export(d[key], img_name, bin=True)
-                mask[key] = {'$imagedata': img_name}
+                mask[key] = {'$vti': img_name}
             else:
                 mask[key] = d[key]
 
diff --git a/invesalius/data/surface.py b/invesalius/data/surface.py
index c061b05..4512ed7 100644
--- a/invesalius/data/surface.py
+++ b/invesalius/data/surface.py
@@ -50,7 +50,7 @@ class Surface():
             if isinstance(d[key], vtk.vtkPolyData):
                 img_name = '%s_%s.vtp' % (filename, key)
                 pu.Export(d[key], img_name, bin=True)
-                surface[key] = {'$polydata': img_name}
+                surface[key] = {'$vtp': img_name}
             else:
                 surface[key] = d[key]
         plistlib.writePlist(surface, filename + '.plist')
diff --git a/invesalius/project.py b/invesalius/project.py
index 14b4c59..f8a5e7e 100755
--- a/invesalius/project.py
+++ b/invesalius/project.py
@@ -138,26 +138,28 @@ class Project(object):
         
         for key in self.__dict__:
             if getattr(self.__dict__[key], 'SavePlist', None):
-                project[key] = {'path': self.__dict__[key].SavePlist(filename)}
+                project[key] = {'$plist': self.__dict__[key].SavePlist(filename)}
             else:
                 project[key] = self.__dict__[key]
 
         masks = {}
         for index in self.mask_dict:
-            masks[str(index)] = self.mask_dict[index].SavePlist(filename)
+            masks[str(index)] = {'#mask':\
+                                 self.mask_dict[index].SavePlist(filename)}
             print index
 
         surfaces = {}
         for index in self.surface_dict:
-            surfaces[str(index)] = self.surface_dict[index].SavePlist(filename)
+            surfaces[str(index)] = {'#surface':\
+                                    self.surface_dict[index].SavePlist(filename)}
             print index
 
         project['surface_dict'] = surfaces
         project['mask_dict'] = masks
         img_file = '%s_%s.vti' % (filename, 'imagedata')
         iu.Export(self.imagedata, img_file, bin=True)
-        project['imagedata'] = img_file
-
+        project['imagedata'] = {'$vti':img_file}
+        print project
         plistlib.writePlist(project, filename + '.plist')
         
         Compress(dir_, "teste.inv3")#os.path.join("~/Desktop/","teste.inv3"))
@@ -173,7 +175,6 @@ class Project(object):
 
         for key in project:
             setattr(self, key, project[key])
-
         print "depois", self.__dict__
         #masks = project['masks']
         #for index in masks:
--
libgit2 0.21.2