Which encoding does Microsoft SSIS use to output flat files in Unicode?

In the Flat File Connection Manager screen there is a checkbox to specify that the file is encoded as Unicode, but there is no way to tell which encoding will be used (UTF-8, UTF-16, ...)

Is there an official Microsoft resource as t开发者_C百科o which encoding is used?

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"Unicode" in Microsoft products tends to be UTF-16LE.