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How can I make image viewer to open PNG files that I download?

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Whenever I download a PNG file it doesn't open up in my image viewer. Instead the default program is keepassx, which is a password manager. How can I change this behaviour? I want PNG files to be opened using my image viewer application. Please help.

Whenever I download a PNG file it doesn't open up in my image viewer. Instead the default program is keepassx, which is a password manager. How can I change this behaviour? I want PNG files to be opened using my image viewer application. Please help.
Screen ƒe photowo kpe ɖe eŋu

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You can add another application to handle PNG files in Preferences > Applications > Portable Network Graphics Image > Use other... When the dialog asks what to use, click the dropmarker next to "KeePassX" and choose the application you just added.

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You can rename (or delete) the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.