PSF is an acronym for Proof Setup File. Files that contain the .psf file extension usually store the color settings that are used by the Adobe Photoshop application. These files allow a user to see accurate previews of how an image will look once it has been printed on paper.
The .psf file extension is also used for Portable Sound Format files. These files are taken directly from video games that are used on a variety of gaming consoles. These PSF files are similar in nature to WAV and MP3 files, but the PSF file format allows for a tighter compression method which takes up less space on a user's hard drive.
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If you have additional information about the PSF file format or software that uses files with the PSF suffix, please do get in touch - we would love hearing from you.