Source Code for Core Data (2nd edition)
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.tgzfile is a gzip-compressed tar archive, and can be extracted with a command such as:
$ tar xzf mzcd2-code.tgz
.zipfile is a standard Zip archive, and can be extracted with (for example):
C:\temp> unzip mzcd2-code.zip
Although not universally true, zip files are more commonly used on Windows systems, while tar files are used on Unix-based systems. You may need to download a separate utility to extract files from an archive on Windows.