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

Problem

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

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Cause

The file had likely been corrupted somewhere between you downloading it, and trying to open it. 

Solution

Delete the invalid file, then return to the portal/project where you had downloaded the file and try to download it again. 

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