Dear all The following is the updated request. The other updated requests is in another e-mail. Regarding the different types of application for the same extensions, there exist a field in ISO/IEC 23000-9 file for identifying video/dmb resources. It is called 'major_brand' in the specification. Actually, 15 brands are defined in the specification; 8 audio brands (which correspond to 'audio/dmb'), 6 video brands (which correspond to 'video/dmb'), and 1 all-in-one brand (which correspond to 'application/dmb'). Different brands for a MIME type exist basically for regional or operators’ different choice for audio codec. The registered Macintosh file type is "dmb " ("d", "m" and "b" followed by space) MIME media type name : video MIME subtype name : dmb Required parameters : none Optional parameters : none Encoding considerations : binary This media type may require encoding on transports not capable of handling binary. Security considerations : It is not possible to inject supported components other than those are specified in the DMB AF specification (ISO/IEC 23000-9) in the dmb file. This might prevent to crash the receiver or temporarily make it unavailable. The authentication mechanism can be used to validate of the sender and the data to prevent security problems due to non-compliant malignant dmb file. Interoperability considerations : A number of interoperating implementations exist within the ISO/IEC 23000 community, and that community has reference software for reading and writing the file format. Published specification : Not published yet. However, ISO/IEC 23000-9 is currently at FDIS stage and expected to be published in Jan. 2008. Applications which use this media : Multimedia applications Additional information : 1. Magic number(s) : none 2. File extension(s) : dmb 3. Macintosh file type code : dmb Person & email address to contact for further information: Hui Yong Kim <hykim5@etri.re.kr <mailto:hykim5@etri.re.kr>> Intended usage : COMMON Author: Hui Yong Kim, editor of ISO/IEC 23000-9 Digital Multimedia Broadcasting Application Format Change controller: ISO/IEC JTC 1/SC 29/WG 11 (MPEG) Regards, - Houari Send instant messages to your online friends http://uk.messenger.yahoo.com