I'm also curious as to the decision to try to make all files have the .ogg extension regardless of content. There are already windows applications that deem .ogg to be an audio type (ie vorbis)... there are also applications that offer file extension filters that distinguish between audio and video files... this is not possible with a single extension. The other problem is application that only play audio (iTunes comes to mind), they will have to allow the user to select .ogg files in order to accept vorbis, but then when it comes time to play them it will realise they also contain video and reject them. What happens when itunes and ipods can handle vorbis/speex, what will happen when itunes lets the user load a theora .ogg file onto their ipod ? This is not good for user experience... the user will be led to beleive the application can handle .ogg files and then be bewildered when it can't. The average user doesn't want to understand the difference between encapsulation formats and logical streams and codecs... they just want it to work the way they expect. There are also applications that can only play vorbis, but not speex, flac or theora... the same issue applies. And just from a user perspective, generally a file type can be determined by looking at it's extension... i know it already annoys me that i have to open the file in a hex editor and look at the headers to determine what sort of file it is. Sure you can write a little program that can identify the contained stream types (ie OOOggStat which is in my project), but most windows users don't have a shell open on their desktop all the time, most don't even use it, smoe don't even know how to open it. And either way that is not a practical solution for most windows users, they just want to look at it and know what it is not run some program to do it. A simple solution would be to have an extension that denotes the file only contains audio, one that denotes it contains audio/video and one for everything else. Just like you can tell an audio only mpeg (mp3) from a video mpeg(mpg) for example. Though i understand there is some resistance to such an approach. What does having a single extension offer besides 'branding' that having a few that better describe the content doesn't. Zen. <p><p>--- >8 ---- List archives: http://www.xiph.org/archives/ Ogg project homepage: http://www.xiph.org/ogg/ To unsubscribe from this list, send a message to 'theora-dev-request@xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.