I have friends who can’t open a pptx- file.
Is this a PowerPoint file you have sent them or is this just a general comment they have made.
If you have sent them a file using Email, what size in Megabytes is it?
Do they have PowerPoint installed?
They tell me it’s because it’s made in a Mac
A PowerPoint file made on a Mac or a Windows computer are identical, there is no inherent problem doing this.
All my work is created on a Mac, 95% of my clients use windows, we have no problems sending each other PowerPoint files.
If you are in a Photo Club why send a PowerPoint file, most clubs insist that all entries must be JPEG image files.
Some are members in the same photo club as me.
If you have JPEG images why are you not sending out JPEG's?