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Internet Explorer used to support any language that Windows Script Host could run. By default, that was JScript and VBScript, but there were third-party engines for Python, Perl, Ruby, Lua, and many others.

Possibly disabled now as they announced VBScript would be disabled in 2019.

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That was something else entirely. Not for scripting but to write compiled ActiveX browser add-ons.
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Yes, we used the plugins from ActiveState on Tcl.
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This is exactly what we need!
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