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So I'm trying to change the language text here by targeting the "en-US" with its actual surrounding quotes as well as adding in "ko" with its actual surrounding quotes

<tt xml:lang="en-US" ...
Both of these fail though, with AHK's error saying that ko is somehow being read as an illegally named variable

Is there some other way to escape these?

Afaics, you have in both cases no closing quote in the second parameter, the Needle. Try
newXML := StrReplace(theXML, "xml:lang=""en-US""", "xml:lang=""ko""")

The old triple-quote conundrum again.
Thanks sir!

dwilbank wrote: ↑ The old triple-quote conundrum again.

Instead of thinking of it as triple quotes, just think that you need a quote at the start and end of your string, and anywhere inside that where you want a quote character, you need two of them. Trying to remember special cases where there are three in a row is unnecessary and just makes it confusing.