Data from an Excel workbook (.xls, .xlsx) might be used as a basis for Microsoft Access database (.mdb, .accdb) and you have essentially two ways how to achieve xlsx to accdb conversion or similar.
If you have access to Access (no pun intended) you can simply use the import/export function to convert xlxs to accdb or vice versa. In case you do not, you have to rely on some kind of database converter that offers tools or acts as xlsx to accdb converter.