Here are the data structures with brief descriptions:

mscab_compressor	TODO
mscab_decompressor	A decompressor for .CAB (Microsoft Cabinet) files
mscabd_cabinet	A structure which represents a single cabinet file
mscabd_file	A structure which represents a single file in a cabinet or cabinet set
mscabd_folder	A structure which represents a single folder in a cabinet or cabinet set
mschm_compressor	A compressor for .CHM (Microsoft HTMLHelp) files
mschm_decompressor	A decompressor for .CHM (Microsoft HTMLHelp) files
mschmc_file	A structure which represents a file to be placed in a CHM helpfile
mschmd_file	A structure which represents a file stored in a CHM helpfile
mschmd_header	A structure which represents a CHM helpfile
mschmd_sec_mscompressed	A structure which represents the LZX compressed section of a CHM helpfile
mschmd_sec_uncompressed	A structure which represents the uncompressed section of a CHM helpfile
mschmd_section	A structure which represents a section of a CHM helpfile
mshlp_compressor	TODO
mshlp_decompressor	TODO
mskwaj_compressor	A compressor for the KWAJ file format
mskwaj_decompressor	A decompressor for KWAJ compressed files
mskwajd_header	A structure which represents an KWAJ compressed file
mslit_compressor	TODO
mslit_decompressor	TODO
msoab_compressor	A compressor for the Offline Address Book (OAB) format
msoab_decompressor	A decompressor for .LZX (Offline Address Book) files
mspack_file	A structure which represents an open file handle
mspack_system	A structure which abstracts file I/O and memory management
msszdd_compressor	A compressor for the SZDD file format
msszdd_decompressor	A decompressor for SZDD compressed files
msszddd_header	A structure which represents an SZDD compressed file