LZSSLib is a compression library (DLL) for Windows programmers.
You have access to compression/decompression functions permitting
file-to-file operations.  LZSSLib uses the LZSS algorithm with
various modifications each providing different enhancements. 
Very simple to use:  LZSSPackFile('PROG.EXE', 'PROG.LZS')
Works with any language that supports DLL calling, such as
Turbo Pascal, C/C++, Actor, Visual Basic, Realizer, even
ObjectVision.