It sounds like the dbf or its index file (adx) is corrupted. Are there any .oyz files present? If so, delete them and the .adx files of the same name and try to open the dbf. If not, copy the .dbf (and .dbt if present) into a test folder and try to open the dbf directly in Approach with no index file. If you still can't open the dbf it looks like it's damaged. Do you have a backup?
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