Added setup.py script for cx_Freeze, which I hope will help building a proper MacOS version. However, the frozen executable is not working correctly yet.

Cura/setup.py

@@ -0,0 +1,23 @@
+import sys
+from cx_Freeze import setup, Executable
+
+sys.path.append('./cura_sf/')
+
+# Dependencies are automatically detected, but it might need fine tuning.
+build_exe_options = {"packages": [
+	'encodings.utf_8',
+	"OpenGL", "OpenGL.arrays", "OpenGL.platform",
+], "excludes": [], "optimize": 0}
+
+# GUI applications require a different base on Windows (the default is for a
+# console application).
+base = None
+if sys.platform == "win32":
+    base = "Win32GUI"
+
+setup(  name = "Cura",
+        version = "RC5",
+        description = "Cura",
+        options = {"build_exe": build_exe_options},
+        executables = [Executable("cura.py", base=base)])
+

Cura/util/gcodeInterpreter.py

@@ -22,10 +22,11 @@ class gcode(object):
 		self.progressCallback = None
 	
 	def load(self, filename):
-		self._fileSize = os.stat(filename).st_size
-		gcodeFile = open(filename, 'r')
-		self._load(gcodeFile)
-		gcodeFile.close()
+		if os.path.isfile(filename):
+			self._fileSize = os.stat(filename).st_size
+			gcodeFile = open(filename, 'r')
+			self._load(gcodeFile)
+			gcodeFile.close()
 	
 	def loadList(self, l):
 		self._load(l)