This is the standard GNU file compression utility, which is also the default compression tool for Debian. It typically operates on files with names ending in '.gz'. . This package can also decompress '.Z' files created with 'compress'.
gzip-win32 | The GNU compression utility (win32 build) | Mehr ...
This is a win32 version of gzip. It's meant to be used by the win32-loader component of Debian-Installer.