Sergey Biryukov

Recent minor updates for WordPress introduced a couple of regressions when uploading audio and video files:
<ul>
<li>
On WordPress 4.3.x and earlier branches, audio/video files cannot be uploaded at all due to a fatal error.
Full list of affected versions: 3.7.19, 3.8.19, 3.9.17, 4.0.16, 4.1.16, 4.2.13, 4.3.9.
This will be fixed in the next minor update, see the <a href="https://core.trac.wordpress.org/ticket/40085" rel="nofollow ugc">Trac ticket #40085</a>.
</li>
<li>
On WordPress 4.4.x and later branches, audio/video files are uploaded with corrupted thumbnails.
Full list of affected versions: 4.4.8, 4.5.7, 4.6.4, 4.7.3.
This will be fixed in the next minor update, see the <a href="https://core.trac.wordpress.org/ticket/40075" rel="nofollow ugc">Trac ticket #40075</a>.
</li>
</ul>
In the meantime, this plugin is a workaround that solves both issues and restores the upload functionality for audio and video files.
Don’t forget to remove the plugin once the next minor WordPress update is available!

Correct Audio/Video Uploads

Restores the ability to upload audio & video files in recent minor WordPress updates.

Josh Maxwell

The <a href="http://ardentpixels.com/" rel="nofollow ugc">Ardent Pixels’</a> Extended MIME Types plugin was created specifically for WPMS in mind. You can now allow all or only select blogs to upload a WIDE range of file types.
<h4>Included MIME Types:</h4>
<ul>
<li>ac3</li>
<li>ai</li>
<li>aif</li>
<li>aifc</li>
<li>aiff</li>
<li>au</li>
<li>avi</li>
<li>bmp</li>
<li>cat</li>
<li>clp</li>
<li>crd</li>
<li>css</li>
<li>csv</li>
<li>csv</li>
<li>dll</li>
<li>doc</li>
<li>docm</li>
<li>docx</li>
<li>dot</li>
<li>dotm</li>
<li>dotx</li>
<li>eps</li>
<li>flv</li>
<li>gif</li>
<li>gtar</li>
<li>gz</li>
<li>gzip</li>
<li>ics</li>
<li>ief</li>
<li>ifb</li>
<li>jpe</li>
<li>jpeg</li>
<li>jpg</li>
<li>js</li>
<li>m13</li>
<li>m14</li>
<li>mdb</li>
<li>mid</li>
<li>midi</li>
<li>mny</li>
<li>mov</li>
<li>movie</li>
<li>mp3</li>
<li>mp4</li>
<li>mpa</li>
<li>mpe</li>
<li>mpeg</li>
<li>mpg</li>
<li>mpp</li>
<li>msg</li>
<li>mvb</li>
<li>pdf</li>
<li>pict</li>
<li>png</li>
<li>pot</li>
<li>potm</li>
<li>potx</li>
<li>ppam</li>
<li>pps</li>
<li>ppsm</li>
<li>ppsx</li>
<li>ppt</li>
<li>pptm</li>
<li>pptx</li>
<li>ps</li>
<li>pub</li>
<li>qt</li>
<li>ra</li>
<li>ram</li>
<li>rtf</li>
<li>rtx</li>
<li>scd</li>
<li>snd</li>
<li>sst</li>
<li>stl</li>
<li>swf</li>
<li>tif</li>
<li>tiff</li>
<li>trm</li>
<li>tsv</li>
<li>txt</li>
<li>w6w</li>
<li>wav</li>
<li>wmf</li>
<li>word</li>
<li>wri</li>
<li>xla</li>
<li>xlam</li>
<li>xlc</li>
<li>xlm</li>
<li>xls</li>
<li>xlsb</li>
<li>xlsm</li>
<li>xlsx</li>
<li>xlt</li>
<li>xltm</li>
<li>xltx</li>
<li>xlw</li>
<li>zip</li>
</ul>
<h3>Notes</h3>
= Donations = 
Feel free to <a href="http://ardentpixels.com/josh/contact/" rel="nofollow ugc">donate</a> if you liked this plugin.

AP Extended MIME Types

This plugin extends the allowed uploadable MIME types to include a WIDE range of file types. Created specifically for WPMS...

Correct Audio/Video Uploads vs AP Extended MIME Types