create an Access DB within x64 applications

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The ACE providers (ACE DAO, ACE OLE DB or ACE ODBC) for Access 2007 product are available only in 32-bit. The ACE providers for Access 2010 product are available in both 32-bit and 64-bit editions.

Basically, there are three possible configurations now.
64-bit Only Solution (64-bit Access, 64-bit Windows)

To implement a 64-bit solution you must do the following:

Deploy 64-bit Access 2010 on 64-bit Windows

Build a custom 64-bit data access application

32-bit Only Solution (32-bit Access, 32-bit Windows)

If you have a 32-bit application, and want it to continue to run unchanged with Access 2010, you must install the 32-bit version of Access 2010.

32-bit Access 2010 works exactly like 32-bit Access 2007 does, and no changes will be required for your VBA code, COM Add-ins or ActiveX controls to continue to function.