@IanM - First off, thank you so much for this extension.
I am getting a "Uploading this file type is not allowed." error when I try to upload a .zip file.
I ensured I added a new mime type and added the recommended line
(video\/(3gpp|mp4|mpeg|quicktime|webm))|(audio\/(aiff|midi|mpeg|mp4))|(image\/(gif|jpeg|png))|(application\/(x-(7z|rar|zip)-compressed|zip|arj|x-(bzip2|gzip|lha|stuffit|tar)|pdf))
It's set on Local, and Default File Download Template. What else should I be doing?
Edit: I discovered that when I clicked the + button to add another mime type, it did not save the line posted above when I refreshed the page. I ended up having to add another one as well and left it blank. So now I have the image one that was there by default, the regex posted above that allows all, and a new blank one. That seemed to let me save it.