Missed these files in the last commit ..

Also meant to mention, on the todo: show the confirmation before closing the file selector, 
rather than afterwards where it's inconvenient and easy to miss...

release/scripts/io/export_ply.py

@@ -275,11 +275,13 @@ class ExportPLY(bpy.types.Operator):
 
 
     path = StringProperty(name="File Path", description="File path used for exporting the PLY file", maxlen=1024, default="")
+    check_existing = BoolProperty(name="Check Existing", description="Check and warn on overwriting existing files", default=True, hidden=True)
     use_modifiers = BoolProperty(name="Apply Modifiers", description="Apply Modifiers to the exported mesh", default=True)
     use_normals = BoolProperty(name="Normals", description="Export Normals for smooth and hard shaded faces", default=True)
     use_uvs = BoolProperty(name="UVs", description="Exort the active UV layer", default=True)
     use_colors = BoolProperty(name="Vertex Colors", description="Exort the active vertex color layer", default=True)
 
+
     def poll(self, context):
         return context.active_object != None