I found reference to .psf embroidery files on several pages, and two of those links are below if you'd like to read them. They're Pulse Stitch Files... unless you're referring to images, then I'd suspect they're Adobe's format as Marcelle has said. hth :) xXx
A file with the PSF file extension is an Adobe Photoshop Proof Settings file.
Other types of files may also use the PSF file extension. If you know of any additional file formats that use the PSF extension.
The easiest way to open a PSF file is to double-click on it and let your PC decide which default application should open the file. If no program opens the PSF file then you probably don't have an application installed that can view and/or edit PSF files.
Adobe PhotoShop program can open them.
Marcelle