The life of a software product is usually marked by the release of different versions. One version differs from the previous one by a small number of changes. Some sections of code in the executable files are different, new files may be added, some even deleted. What the author of the product usually does, is provide a new version of the files either as a new re-installable product or just the modified files, compressed. The above procedure is very wasteful though. For example, if a file of 1Mg has only had say 10Kb altered within it, then why create an update patch that requires the full 1Mb. It would be far more efficient if just the altered data were used. Well this is the purpose of Patch Maker. This utility saves a huge amount of bytes by storing just the differences between files and even compressing this data. This method has two distinct advantages: **Very small update patches, independent of the size and number of files of the original installation.