221 Interchange File Aggregate This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’. Text 1 Digital Preservation Department / The National Archives 02 Aug 2005 02 Aug 2005 x-fmt/157 PUID iff File extension 456 Interchange File All interchange file format files must start with either 'FORM', 'LIST', or 'CAT ' values. This is a generic signature that will identify Interchange Files which do not have a more complete and specific signature assigned to them within PRONOM. 1 Absolute from BOF 0 (464F524D|4C495354|43415420)00 Has lower priority than 195 Audio Interchange File Format (compressed) Has lower priority than 1083 Interchange File Format Interleaved Bitmap Has lower priority than 1084 Interchange File Format 8-bit Sampled Voice Has lower priority than 1192 Audio Interchange File Format Has lower priority than 1194 Cinema 4D Has lower priority than 2015 LightWave 3D Object Has lower priority than 2016 Impulse 3D Data Description Object Has lower priority than 2831 Final Writer Document Is supertype of 1083 Interchange File Format Interleaved Bitmap Is supertype of 1084 Interchange File Format 8-bit Sampled Voice