> it's probably not binding for reverse engineering based on the open source unrar. I think the "secret sauce" is the compression-specific code that allows it

> it's probably not binding for reverse engineering based on the open source unrar. I think the "secret sauce" is the compression-specific code that allows it to reach the high compression ratio which is one of the selling points of the format. Reverse-engineering the decompression code will allow you to create valid RAR files but may not give you any clues as to how to reach the high compression ratio of the original compressor.