diff --git a/mozpluggerrc b/mozpluggerrc
index 7d45dea..0bdd6bc 100755
--- a/mozpluggerrc
+++ b/mozpluggerrc
@@ -105,6 +105,7 @@ video/x-mpeg2:mpv2,mp2ve:MPEG2 animation
 video/mp4:mp4:MPEG4 animation
 video/msvideo:avi:AVI animation
 video/x-msvideo:avi:AVI animation
+application/octet-stream:mkv,m4v:AVI animation
 video/fli:fli,flc:FLI animation
 video/x-fli:fli,flc:FLI animation
 	MP_VIDEO_STREAM()