Client: "Can we have the info of the report as a spreadsheet?"
Sure. To minimise change, I just make it so that instead of the PDF report, the app downloads a zip file with the report, and an Excel file with the info.
A week later, the client: "when we download the list of evaluated people, it downloads a weird file there's no way of opening" (sic, except translation)

... What? Are we just stupid now? Even Windows explorer should be able to deal with that...

I HOPE I'm misunderstanding and there's a real issue, because if they really are complaining about using zip files... I don't know what I'll do.