The bundle (BND) format contains a series of RIFF chunks or other multimedia files. The BND file is defined as follows:
<BND-file> RIFF('BND' <CTOC-chunk> <CGRP-chunk> )
The <CTOC-chunk> and <CGRP-chunk> formats are defined in the OS/2 Multimedia Application Programming Guide.
Each compound file element must be capable of standing alone as an independent file. An element cannot be a random chunk (except the RIFF chunk, indicating a RIFF file) or random binary data (unless the binary data is to be treated as a file).