And to head off a possible question. No, I don't know of any free tools except from our backup copies.
I have an executable file which was created from a PowerPoint file but have lost the original file. Any help with converting the .exe back to a usable PowerPoint file is greatly appreciated.
Light bulbs you shouldn't buy
There are plenty of dimmable LED light bulbs, but make sure you don't buy the ones that flicker when you dial them down.