Drag and drop powerpoint file to mediamanager fails to load file

Confirmed in beta3 and bzr2528 on windows. Also reported in the forum: http://forums.openlp.org/discussion/2592/bug-unable-to-import-powerpoint-file-via-drag-and-drop

When dragging a powerpoint file to the mediamanger the loading fails and the errors below is shown in the log. This only seems to happen when using powerpoint as the presentation loader.

2015-04-05 19:00:07,502 openlp.plugins.presentations.lib.impresscontroller WARNING Failed to get COM service manager. Impress Controller has been disabled
2015-04-05 19:00:58,461 openlp.plugins.presentations.lib.powerpointcontroller ERROR Exception caught while loading Powerpoint presentation
Traceback (most recent call last):
  File "D:\OpenLP_Development\OpenLP_Code\openlp\openlp\plugins\presentations\lib\powerpointcontroller.py", line 137, in load_presentation
  File "<COMObject <unknown>>", line 3, in Open
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2147024894), None)
2015-04-05 19:00:58,468 openlp.plugins.presentations.lib.powerpointcontroller ERROR (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2147024894), None)
Traceback (most recent call last):
  File "D:\OpenLP_Development\OpenLP_Code\openlp\openlp\plugins\presentations\lib\powerpointcontroller.py", line 137, in load_presentation
  File "<COMObject <unknown>>", line 3, in Open
pywintypes.com_error: (-2147352567, 'Exception occurred.', (0, None, None, None, 0, -2147024894), None)
2015-04-05 19:00:58,508 openlp.plugins.presentations.lib.powerpointcontroller ERROR OpenLP Error trace
   File <string> at line 44
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\__init__.py at line 377
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\__init__.py at line 162
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\__init__.py at line 92
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\lib\listwidgetwithdnd.py at line 105
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\common\registry.py at line 137
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\lib\mediamanageritem.py at line 343
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\lib\mediamanageritem.py at line 377
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\plugins\presentations\lib\mediaitem.py at line 186
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\plugins\presentations\lib\powerpointcontroller.py at line 156
  called None
   File D:\OpenLP_Development\OpenLP_Code\openlp\openlp\core\common\__init__.py at line 52
  called None