The presentation file I was having the problem with
Humeruskopffraktur.odp (application/vnd.oasis.opendocument.presentation), 692.82 KB, created by director84 on 2018-05-15 16:18:58 UTC
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Creator: director84
Created: 2018-05-15 16:18:58 UTC
Size: 692.82 KB

Attachment is not viewable in your browser because its MIME type (application/vnd.oasis.opendocument.presentation) is not one that your browser is able to display.

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Attachments on bug 117627: 142116 | 142117 | 142118