[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:  4.7.1
 Severity:  critical                |  Resolution:
 Keywords:  has-patch dev-feedback  |     Focuses:
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Comment (by blobfolio):

 Hi @btolman,

 I haven't tested the third iteration of the patch on Multi-Site or Windows
 yet. I would be grateful if you'd give it a shot and report back. That
 would be a big help!

 There shouldn't be any conflicts with Multi-Site. The only WordPress
 functions referenced by the new class (which is limited in scope to trying
 to find a file extension/MIME pairing) are `sanitize_mime_type()`,
 `wp_check_invalid_utf8()`, and `wp_get_mime_types()`.

 I did anticipate a few Windows-specific quirks with `finfo_file()` that I
 hope will result in a much more conservative effect on upload validation
 (erring on the side of "trust the filename"). The MIME/ext database this
 draws from has about 14x the amount of data the built-in WP version
 contains, so it should be much better at mapping OS/PHP-specific
 variations.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39550#comment:69>
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