Dedicated database conversion programs like the Full Convert Enterprise allows users to export data from broad range of database formats to a simple Excel spreadsheet, which means mdf to xlsx conversion or data export is possible.
It can be most likely also done using database management tools that support MDF format and allow for export to CSV which can then be imported to Excel or other spreadsheet program to be saved as XSLX.
Open MDF file Open XLSX fileA powerful database to database converter