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


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.



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


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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