About .ps graphic file:

PostScript (PS) is a dynamically typed concatenative programming language, best known for its use as a page description language in the electronic and desktop publishing areas. Once the de facto standard for electronic distribution of final documents meant for publication, PostScript is steadily being supplanted in this area by one of its own descendants, the Portable Document Format (PDF).

You may occasionally encounter files containing a stream of PostScript data. These files may typically be sent directly to a PostScript compatible Printer for printing.

More commonly, you may encounter Encapsulated PostScript files which typically contain a section of a page or an individual graphic.

Help how to open PS files:

Use Adobe Acrobat Distiller from Creative Suite 4 (or Adobe Photoshop, Adobe Illustrator).

How to convert file with extension PS:

Use Adobe Photoshop.