This is why I like HN. Opening the comments and seeing "oh maybe this is due to something I did back in the 1980s when I wrote most of that, here's some inside

This is why I like HN. Opening the comments and seeing "oh maybe this is due to something I did back in the 1980s when I wrote most of that, here's some inside info/explanation" about something as significant as Excel's file handling is something that will never grow old for me.