📌 In other preconditions, the .PUP instances may be oriented on the installation packages exploited by Puppy Linux, a custom variant of the Linux distribution distinguished by the easy usage and employment. This specific .PUP entry is referenced as a “DotPup” resource. When a relevant .PUP file sample is opened, it automatically runs an installer of the assigned Linux fork. Generally, the noted .PUP objects are operated and behave similarly to .MSI or .EXE resources employed by typical Windows software installation bundles. In the subsequent years, the specification has at most been substituted and superseded by the .PET extension branch with the release of newer Puppy Linux editions. The following category of .PUP instances is recognized by the Linux system only.
📌 A .PUP data entry is related to a patch or file applied to update the PlayStation 3 (shortly, PS3) system firmware. Particularly, the relevant .PUP item may be composed of custom bug fixes, security patches, or auxiliary predefined features of the operating system. In common, the accustomed .PUP resources are entitled as PS3UPDAT.PUP. You can make a choice to properly update the PS3 firmware by downloading the requested .PUP sample from the trusted Internet-resource precisely to the console. You may also intermediately copy the .PUP record to the computer, afterwards transferring it to the storage media, such as a USB storage device or hard disk. In the latter case, you would be suggested to put the outcome .PUP entity to the /PS3/UPDATE directory of your PlayStation 3 console. In order to initialize the PS updating routine, pick Settings -> System Update option from the UI menu of the console.
📌 In other circumstances, the .PUP object can relate to the system update file record, exploited by the Sony PlayStation 5 or 4 consoles. Essentially, the item includes firmware that is suggested to be opened up, installed and configured on the respective game console. .PUP entries designated for the PS5 console are normally entitled as PS5UPDATE.PUP entity. At the same time, the noted .PUP instances related to PS4 devices are named as PS4UPDATE.PUP definition. In the usual circumstances, the PS5 and PS4 consoles update their system firmware in the automatic way as required, through an online web-connectivity session. Nevertheless, the user may decide to update his PS5 or PS4 firmware manually. In order to implement this idea, the user is suggested to download the corresponding .PUP file object formerly from the genuine PlayStation.com server.
How to open an .PUP file?
📌 The aforementioned file entities can be easily opened, processed and handled by your PS3, PS4 or PS5 firmware update utility, accessible from the primary UI menu. Therefore, in order to reveal and explore the .PUP entry contents in the scope of Windows PC shell, you can make use of unofficial PS3 PUP Extractor utility, able to extract the disk object contents to a clear, transparent form. Besides, the noted file category can be utilized by Puppy Linux distribution installer, which serves for the deployment and implementation of custom Linux packages to Linux shell, similarly to the .MSI and .EXE formats, accustomed to ordinary Windows users. The .PUP suites are suggested to be operated and handled in command-line console mode, with the utilization of specific instructions, commands and key parameters.
Wikipedia:
PS3 PUP Extractor