Index: source/Host/common/File.cpp
===================================================================
--- source/Host/common/File.cpp
+++ source/Host/common/File.cpp
@@ -45,7 +45,7 @@
             else
                 return "a+";
         }
-        else if (options & File::eOpenOptionWrite)
+        else
         {
             if (options & File::eOpenOptionCanCreateNewOnly)
                 return "ax";
Index: source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
===================================================================
--- source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
+++ source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp
@@ -1255,7 +1255,7 @@
     .Case("a",   File::eOpenOptionAppend|File::eOpenOptionCanCreate)
     .Case("r+",  File::eOpenOptionRead|File::eOpenOptionWrite)
     .Case("w+",  File::eOpenOptionRead|File::eOpenOptionWrite|File::eOpenOptionCanCreate|File::eOpenOptionTruncate)
-    .Case("a+",  File::eOpenOptionRead|File::eOpenOptionWrite|File::eOpenOptionCanCreate)
+    .Case("a+",  File::eOpenOptionAppend|File::eOpenOptionRead|File::eOpenOptionCanCreate)
     .Default(0);
 }