The .sav extension is most commonly used by gaming applications to save user configurations, game objects and characters within the gaming application for the user's next game session.
While .sav files have no general limits themselves, many gaming applications limit the number of SAV files that the program will accommodate. For example, one video game may only allow one SAV file while another may allow five. The data in each SAV file is specific to the game that it was created for.
In some cases a file with a .save extension will be created by other computer applications for backup and configuration purposes.
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If you have additional information about the SAV file format or software that uses files with the SAV suffix, please do get in touch - we would love hearing from you.