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So I have a windows 10 dell laptop which is 64 bit and recently I was going to my C:\ drive to delete the windows.old folder but I noticed another folder called WCH.CN with another folder inside it called CH341SER and I wanted to delete this folder as I am not familiar with it and what it does so it is okay to delete WCH.CN folder?

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You can safely delete that folder. It is the location where the setup program for the "CH341 (USB=>SERIAL chip) V3.4" driver is decompressed.

That driver is used for a USB controller commonly found on 3rd party Arduinos.

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