Check the downloaded file is valid by opening it with a text editor and seeing if it has your issues in it - the file is actually xml that says "hey, I'm a spreadsheet".
Also, rather than directly opening the file it provides with "open in excel", save it and try opening the saved file. Does that help?
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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