Thank you both for offering advice regarding Yenc and my older Mac.

I have tried that software before and have never been able to get it to
work on my system.

I appreciate that those that like Yenc like it a lot and that
those who don't like Yenc hate it with a passion.

As for me my attitude is simple.

If people wish to post pictures in various formats that not all people
can view including myself then my attitude is that I can't miss what
I can't see.