[wp-trac] [WordPress Trac] #39550: Some Non-image files fail to upload after 4.7.1

[WordPress Trac]

#39550: Some Non-image files fail to upload after 4.7.1
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 Reporter:  greatislander  |       Owner:  joemcgill
     Type:  defect (bug)   |      Status:  assigned
 Priority:  normal         |   Milestone:  4.7.2
Component:  Upload         |     Version:  trunk
 Severity:  normal         |  Resolution:
 Keywords:  needs-patch    |     Focuses:
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Comment (by SpencerFinnell):

 @stiofansisland's `test.csv` shows a `text/plain` mimetype for me and I am
 unable to upload on 4.8-alpha-39850

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Ticket URL: <https://core.trac.wordpress.org/ticket/39550#comment:15>
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