Disable Real MIME Check
Restores the ability to upload non-image files in WordPress 4.7.1.
With the upgrade to WordPress 4.7.1, some non-image files fail to upload on certain server setups. This will be fixed in 4.7.2, see the Trac ticket.
In the meantime, this plugin is a workaround that disables the recently introduced strict MIME check to restore the upload functionality.
Don’t forget to remove the plugin once WordPress 4.7.2 is available!