A file with the .xlsx file extension is a Microsoft Excel Open XML Spreadsheet (XLSX) file created by Microsoft Excel. You can also open this format in other spreadsheet apps, such as Apple Numbers, Google Docs, and OpenOffice. They are stored as a compressed Zip file, which contains a bunch of other files used to open the document.
Creating a family tree is a fun and interesting activity to do on your own or with your family. It may even be homework for your child. Luckily, if you have Excel, you can make a family tree easily.
Despite Windows 10 having launched over six years ago, a Windows 9 reference was found still intact in the recent Windows 11 Dev channel build 22567 system file. The file mentions Windows Blue too.