TOPIC:

I have a Typon32 app that connects to an .mdb database using File.dsn. This File.dsn doesn't work in 64-bit Windows I think because the mdb driver is not available for 64-bit.

What can I do?

Did you try MDAC 64bit?
www.microsoft.com/en-us/download/details.aspx?id=13255

Installed 64-bit Office 2010 and MDAC and recreated the File.dsn specifyin mdb driver, but I still get an error saying the File.dsn is incorrect.

msdn.microsoft.com/en-us/library/cc645931.aspx
Data Source Names and 64-Bit Operating Systems
To build and run an application as a 32-bit application on a 64-bit operating system, you must create the ODBC data source with the ODBC Administrator in %windir%\SysWOW64\odbcad32.exe.
Remarks
A 64-bit Windows operating system has two odbcad32.exe files:
%SystemRoot%\system32\odbcad32.exe is used to create and maintain data source names for 64-bit applications.
%SystemRoot%\SysWOW64\odbcad32.exe is used to create and maintain data source names for 32-bit applications, including 32-bit applications that run on 64-bit operating systems.

This could help

Thank you Jesus and Tony Gallos! That did the trick. You saved my life. Many thanks, my friend.