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I copy .tex file from MikTeX to Scientific Word; in MikTeX, everything is fine; but in SW, I got etex.sty not found. error.

I copy the file stex.sty from MikTeX to SW; then I go the following error message.

! Package etex Error: This package may only be run using an
(etex) etex in extended mode.

I checked my MikTex and find the etex file:

C:\Program Files\MiKTeX 2.9\tex\latex\misc

But it does not say which package the file is in? You know that means I do not know which package I need to add to SW.

Could someone help me with that?

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Welcome to TeX.SX –  Adam Jul 13 '13 at 18:38
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Confusingly, there are two things called etex: a version of TeX that has more features, and a LaTeX package that uses these two features. Obviously, you are using a package that needs the etex package, but this package only works with the etex version of TeX. As stated in the reply to your question at the MacKichan website, Scientific Word does not support the etex version of TeX. This means that you cannot use whatever package that needs etex with Scientific Word; you will have to write this document entirely with MiKTeX, or remove that package.

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the question is malformed, in fact. there are two names: e-TeX for the extended version of TeX, and etex.sty for the macro package. (doesn't impact on the value of your answer, but...) the original question is not about failure to find etex.sty, but the fact that scientific word won't run etex.sty –  wasteofspace Jul 13 '13 at 6:34
TeX distibutions have been using 𝜀-TeX as the engine for LaTeX since at least ten years. It's rather strange that MacKichan never found the time for upgrading. –  egreg Jul 13 '13 at 9:48
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