We have found one software suitable in our database for this conversion.
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.
MDF
An mdf file extension is used for a database file format for Microsoft SQL Server, relational database server, developed by Microsoft, with latest version being 2016.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.