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Thanks Tom,
These are temporary files I know are only opened exclusively. The DBZAP() executed without error several times before on these files before the IDSC error. I will check into the Virus Protection as a possible culprit!
Doug

I am intermittently getting a "Internal data structures corrupted" (IDSC) on a THEDBF->(DBZAP()) command. The .dbf is a temporary file created by the program with a .NTX and use exclusively. The code will execute the DBZAP several times before it throws and IDSC error. It happens on different .dbfs ...