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Puppy Package Management system. Alternatively you can run a Pet file and it will automatically install the 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.
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Puppy Package Management