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Puppy Package Management system. Click on a downloaded Pet file to install software.
MD5sum appended on the end. The in-built MD5sum is handy, as the file can be checked for integrity after being downloaded. They are used for packaging programs designed or compiled for Puppy and provide desktop icons, menu info etc specific to Puppy. Tarball files have a .tar extension. Or tar.gz if compressed with gzip. Pet files on the other hand have a .pet extension.
Puppy Package Management
Barry's Blog Pet Page
Guide to making PET files