Windows Vista Viewing Powerpoint files from Windows Mail

A .pps attachment in Windows mail will not open because of a File association problem. (.pps files are in fact associated with Powerpoint Viewer) If I save the attachment to a file then I can open it. Embarassingly I found a "solution" on this site but it did not work for me .....and I cant find it again.

It suggested changing the registry entry for HKEY_CLASSES_ROOT\PowerpointViewer.SlideShow.11\shell\show
to
HKEY_CLASSES_ROOT\PowerpointViewer.SlideShow.11\shell\open

similarly for .......... .SlideShow.12

After a reboot this makes absolutely no difference. I verified that the registry entries were in fact changed.

Would appreciate help/advice

 

This looks like the suggestion
http://www.winhelponline.com/blog/unable-to-open-pps-ppt-from-windows-mail-or-wlm/

 

Thanks for locating the article for me ....

It apparently has not resolved the problem for others either/ or has resolved and had adverse side affects.

Any more advice would be appreciated