I keep getting a HTTP error when I try to download a video from my server that's in the .mkv format.
I thought that this was probably a MIME type problem, so I added the following MIME types to Abyss :
- video/x-matroska for .mkv
- audio/x-matroska for .mka
The videos now show up with those MIME types, but it didn't fix the problem.
Here are some screenshots :

The error message says that the HTTP header provided is not valid.
I'm getting this error with Internet Explorer 7, if I use FireFox 2 it works.
The .mkv is setup properly on my PC, as I can play them with fine with VLC or Media Player.
Not that this should have any infulence, as I should still be able to download it, codec installed or not.
Does anybody have a suggestion?