open .mdb database

[rolfk]

The problem is that you are using LabVIEW 32-bit but the ODBC Administrator that you start from your Control Panel is the 64-bit variant since you are running 64-bit Windows. Instead you want to start the 32-bit version of the ODBC Administrator in C:\Windows\SysWOW64\odbcad32.exe. This version will enumerate the 32-bit ODBC drivers and there you have a JET DB driver. You can then setup a DSN in there that you can use from the Database VIs when running LabVIEW 32-bit. 

[Frozen]

I found that the ACE drivers are better than the JET drivers.

The connections string is also a bit tricky.

The above connection string:

Provider=Microsoft.ACE.OLEDB.12.0;Persist Security Info=False;Data Source="%s"

[labview99]

Thank you so much for your help! Now it works!