Why does Excel say it can't open my file because the file format or extension is not valid?

Occasionally, when attempting to open up a BidTable or Questionnaire file in Excel, you may receive a message saying that the file cannot be opened because the file format or file extension is not valid.

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Typically, this indicates the file has likely been corrupted, or may not be a valid XLS/X document.

To resolve the issue, delete the invalid file, then return to the portal/project where you had downloaded the file, and re-download it.

If you continue to experience errors, please reach out to Bonfire Support!

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