WinZip Self-Extractor creates self-extracting Zip files. These self-extracting Zip files are ideal for electronic file distribution, because they can contain multiple compressed files, minimizing download time and ensuring that important files do not become separated from the rest of the package and allow the receiver to use a familiar Windows interface to decompress files without a separate unzip utility. Additionally, self-extracting Zip files can optionally run a "setup" or "installation" program, provided by the creator, after the files are decompressed.