poscript("fileName.eps") possible?

I have been checking the information provided with postscript().

Acording to the manual the argument of postscript() is the name of a
file with extension ps .

The postscript produced by R is EPS (Encapsulated PostScript)
     compatible, so I tried to pass to postscript() the name of a file
with extension eps. Then I included this file in
a Latex document and everything worked fine.

Does what I did work in general or I just was lucky?
Thank you.

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