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<p>I am delighted to report that no enhancement is needed :
TeXworks selects the correct "typesetting engine" (the Algol-68
Genie compiler/interpreter) with the following top-of-file pragmat
:</p>
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<blockquote type="cite"><tt>COMMENT % !TeX Program=Algol-68 </tt>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;
margin-right:0px; -qt-block-indent:0; text-indent:0px;
line-height:100%;"><tt>COMMENT </tt></p>
</blockquote>
-- <br>
<i>Philip Taylor</i><br>
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