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Does DllCall ever set @extended?

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I am writing an error handler for my script. The DllCall function, as documented, may set @error with values between 1 and 5. There is no mention in the documentation of ever setting @extended, but the implementation of the _WinAPI_ functions are "protecting" this value (passing it to SetError). Is this just a conservative or forward looking coding style, or does this value has relevant values in some situations?

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