This file does not have a program associated with it for per

When right clicking on a jpg image I and selecting "Set as desktop background" i get the following error message. The funny thing is when i double click or select open from mouse context menue everything opens up fine

OS:
Windows 7 Beta
Directory Opus 9.1* (current)

ERROR MESSAGE:

This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.

google.com/search?hl=en&q=Th ... tnG=Search

Tools > File Types > System File Types >

Extentions | Desctiption | Group
JPE | JPEG Image | Images
JPEG | JPEG Image | Images
JPG | JPEG Image | Images

All are set to open with Windows Photo Viewer, I've already tried to remove and re associate this with another viewer, none seem to work

Is the same menu item available in Explorer? If so does it work there or the same thing?