EXCEL & POWERPOINT PROBLEMS
Three long years ago I made a short movie about the Excel - Powerpoint - Problem. If you open a Powerpointfile in Excel, it says: 'Invalid File'. Why? It is one Office Suite. Surely, Excel can suggest opening Powerpoint for you. The same goes vice versa.
Recently I migrated to Windows 10 and Office 2016. Immediately I checked, and the problem still persists. So, here is the movie again. Maybe, if you share it, this time, Micrsoft will fix it.
But I am not counting on it!