DAVE should only propose to "Save File" when opening the download

Originally created by @sajolida on #10681 (Redmine)

And not propose to open it with the archive manager. This might be possible using MIME types.

During the UX testing, we’ve seen at least two people open the ISO file instead of saving it and then they were lost for the cause…

Edited May 15, 2020 by sajolida

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