The problem isn't with thumbnailing, but when that is turned off. I'm attaching a composite shot of nautilus (thumbnails turned off), ls and file.
Nautilus recognises the .mkv file as matroska, and will open it with totem which will play it, but it won't show a media file icon. Likewise, file will show the right data, but ls won't apply the correct colour coding. ** Attachment added: "Illustrative screenshot" http://librarian.launchpad.net/5870189/Screenshot.png -- Some media files are not recognised as such (ogm, mkv, mka) https://launchpad.net/bugs/81122 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs