{Microsoft Access Driver (*.mdb)} is the name of the older Microsoft Jet driver, which will only work in 32-bit applications. (There are no 64-bit versions of the Jet database engine or the Jet ODBC driver.)
To connect with .mdb and .accdb files from a 64-bit application you need to download and install the 64-bit version of the Access Database Engine (a.k.a. “ACE”) from here, and then refer to it in your application by using the driver name {Microsoft Access Driver (*.mdb, *.accdb)}.
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