# Cannot perform tamper detection

If detection report shows: "Cannot perform tamper detection. The selected file's formatting information is old or is not recognizable", consider the following causes:

- The CSV data log file does not contain tamper detection strings.
- The CSV data log file was modified in Microsoft Excel.

## See also

CSV Data Log Tamper Detection Utility

Detect the integrity of a CSV data log file using the CSV Data Log Tamper Detection Utility

Detect the integrity of a CSV data log file using a command

CSV data log file