Allow .flv formats to be uploaded

In your admin panel, go to options.php (I think you’ll have to type it in, as 2.0 strangely doesn’t have a link to any page that lets you set this option).

Scroll down to fileupload_allowedtypes and add the extensions you want to that box, and hit enter.

If you’re using a version prior to 2.0, just go to Options – Misc. Not sure why they took this out in 2.0.