file types

I've been thinking about these new file types that are being released, massive database files that contain a range of media, data content. The manner of their production and the means of their distribution interest me greatly, that they might contain dynamic & static data, raster and vector operate as a meta file, database etc. My thought might be to develop a file type. '.kev' files for example, this file type might provide for a complete public art meta file dealing with some of the issues highlighted by the ReallyGoodBad public art project. Need to find more about file formats and how they gain interoperability.