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I'd like to change "Platform default charset" from UTF-8 to other charset.
If is there someone to know the way, please teach me.
Not sure if I understood correctly, but if you are talking about the code, you can attempt to go under Options -> User Settings -> Edit User Settings -> Localization -> Code Page.
If I understood wrongly then maybe this page would serve to help. https://help.alteryx.com/2018.2/CodePages.htm