I have a table in XL that I've been updating for years, first as an .XLS in Excel 2003, now in Excel 2016. I just saved the latest version as an .XLSX file. Now, when I right-click Excel on the taskbar, I don't see it in the list of recent files. But now i have an icon for Microsoft Open XML Converter, and the file is pinned to that icon.

How do I get it pinned to the Excel icon?