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  • Are you perhaps adding an entry which points to a 32-bit DLL, into the 64-bit Registry? Commented Feb 19 at 10:51
  • @u1686_grawity Thanks for the suggestion but no that's not it. Both the 32bits or 64bits drivers are displayed, regardless of whether you open the 32-bit or 64-bit ODBC Data Sources. The only difference is that when you open for example the 64bit ODBC, then you can only edit 64bit entries, but afaik it should show all entries.
    – BdR
    Commented Feb 19 at 10:58
  • @BdR They DON'T show all entries as far as I know.
    – Tonny
    Commented Feb 19 at 11:09
  • Access 365 can also use key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\REGISTRY\MACHINE\Software\ODBC\ODBC.INI\ODBC Data Sources. Note also that Access can open an ODBC connection without a DSN by using the data under your registry key, the Windows API does not oblige using a DSN.
    – harrymc
    Commented Feb 19 at 11:49