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When I download a file it automatically wants to open in excel and is garbage. How do I fix this problem?

When I download a file it automatically wants to open in excel and is garbage. How do I fix this problem?
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Hmm, PDFs do not normally want to open in Excel. I'm not sure what is happening there. Could you double-check your PDF setting, that it points to opening in Firefox or a more logical PDF reader? This article has the steps:

View PDF files in Firefox or choose another viewer