On Windows, ODBC DSN information is stored in the Windows Registry. System DSNs can be found in the registry keys
DSNs for 64-bit drivers:HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INIDSNs for 32-bit drivers:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ODBC\ODBC.INI
and User DSNs can be found in
HKEY_CURRENT_USER\SOFTWARE\ODBC\ODBC.INI
If a DSN does not appear in the ODBC Administrator (odbcad32.exe) it might be because the DSN name is not included in the list of DSNs in the corresponding subkey
...\ODBC.INI\ODBC Data Sources
Paths to odbcad32.exe:
x86:
%windir%\syswow64\odbcad32.exe
x64:
%windir%\system32\odbcad32.exe
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