SI Files
SI files are general purpose asset archives derived from the Resource Interchange File Format standard (best known as the basis of AVI and WAV files). SI files are known to contain Microsoft WAV compatible audio and BMP file format compatible graphics.
To compensate for slow, early CD-ROM speeds, various types of data in SI files are often interleaved so they can be read as one continuous stream. For example, a chunk of music data may be followed by a chunk of animation data or a bitmapped graphic. This helps reduce the amount of seeking around the disc for assets, but needs to be taken account when extracting data from an SI file since one file stream may be separated into several chunks with chunks of other data types between them.