Thank you for this link.
I was trying to apply the fix described there:
Fixes For “Reserved Error -7748” in MS Access 2003, 2007, and 2010
You must keep a proper backup of the registry before making any changes.
In order to resolve this error, set WorkArounds2=8192 for the affected data source. This can be done by using the Registry Editor (RegEdit).
1. Run RegEdit
2. Search the ODBC DSN in the Registry:
For a USER Data Source, go to HKEY_CURRENT_USER -> Software -> ODBC -> ODBC.INI -> YourDataSourceName
For a SYSTEM Data Source, go to HKEY_LOCAL_MACHINE -> Software -> ODBC -> ODBC.INI -> YourDataSourceName
For 32-bit applications (ODBC drivers) on 64-bit Windows, (MACHINE) Data Source, go to
HKEY_LOCAL_MACHINE -> Software -> Wow6432Node -> ODBC -> ODBC.INI -> YourDataSourceName
3. tap to the folder for your data source, from the menu select:
Edit -> New -> String Value
4. Assigned name to the new string value to be WorkArounds2
5. Make a double tap on the WorkArounds2 in the right hand panel as this will opens up a dialog box with the data value field.
6. Change the data value to 8192 (The string value that must be added to Windows XP SP2 and Progress 10.1A02 is WorkArounds2=40960)
7. Click OK
8. Close RegEdit
If you are using Windows 95 and 98 then you need to reboot, then only the change done in settings will get into effect.
Unfortunatelly I cannot find my DSN file in the registry (see screen attached).
Do you know what should I do, to see my DNS there?