Files that contain the .pup file extension are most commonly associated with the Puppy Linux operating system. Puppy Linux was created to be a user-friendly version of the free Linux operating system.
A PUP file is run when an installer program is opened on the user's computer when that computer is running on Puppy Linux. These files are similar to the installer.exe files that are used with the applications that are run on Windows, but the PUP are used for applications that run on the Puppy Linux OS instead.
PUP files are commonly referred to as "Dot Pup" files.
The PlayStation 3 gaming device also uses the .pup file suffix. These PUP files contain update files for the PlayStation 3 hardware.
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If you have additional information about the PUP file format or software that uses files with the PUP suffix, please do get in touch - we would love hearing from you.