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If using TecDoc.mdb (Access), try compacting/repairing with Microsoft Access or a third-party MDB tool.
TecDoc heavily relies on Windows Registry keys to find its data. If the configuration file seems correct but the error persists: Registry Editor Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\TECDOC (for 64-bit systems) or HKEY_LOCAL_MACHINE\SOFTWARE\TECDOC Check the string values for . Ensure they match your current installation directory. 3. Run as Administrator If using TecDoc