Righht click on the file you want to open and select Open With-->Chouse Default Program. Browse to POWERPNT.EXE and selact "Always use...".
Hi Petar, Thanks for the answer. I don't have power point, I only have the free powerpointviewer. PowerPointViewer does not show up as a program in "control panel / defaut program", so I can't correct this problem.
Do the same as described above, but only browse to the free powerpointviewer. PowerPointViewer executable.