Post Script and Enhanced (or Encapsulated) Post Script is a very general name given to a very large variation of file structures.
Not even Adobe applications can open every .ps or .eps file available on the internet.
The Celtic Knots in Advocate's link is a .ps created using Flexisign Pro which is an application designed for Vinyl Sign Cutters. The file has a header which is a 133KB embedded thumbnail image.
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