Microsoft never fails for finding new ways to annoy customers.
I have years and years of spreadsheets that were created using Excel 2003, and which are (naturally) in the .xls file format.
Not very long ago I finally retired my old Windows XP desktop computer and started using a newer one, running Windows 7. I installed my Office 2003 Professional suite, and I also installed Office 2016 Professional. Why do I need both? Technically, I don't -- but I hate the new ribbon menu layout, and the add-on that emulate the old menu structure isn't quite as perfect as the authors would like us to believe. Plus, for jumping into an old .xls spreadsheet to check something or to insert a quick update, I can load it, do the task, and be done using Excel 2003 while 2016 is still showing me the splash screen.
So I would like to set Excel 2003 as the default program to open all .xls files when I double click on them in Windows Explorer.
Windows won't let me do that. Excel 2003 is there, is fully functional, and I can start it from the Start menu or using a desktop shortcut. But when I go into Control panel and try to select Excel 2003 as the default program to open .xls files, it won't let me do that. It doesn't even allow me to see Excel 2003 as a potential choice. I can see LibreOffice calc ... but not Excel 2003.
Microsoft, may your entire organization be thrown into the sun and consumed in the fires that warm the hearts of computer users everywhere.