ZIP Help Page
Most of the data files on MSDIS have been zipped or gzipped (compressed) for faster download time. gzip compresses ascii files by 50-70%. Most modern operating systems come with embedded zip software which should be able to unzip any of the files avaialable from MSDIS. You can also use a bolt on zip utility such as WinZip.
|WinZip for Windows will process .zip and .gz files|
Alternatively you can use one of many other zip utilities many of which are available free of charge and can easily be found via internet search.