If you keep notepad open, and simply ctrl-z to undo the change, then you can.
However, when you open it in Notepad, Notepad doesn’t actually know what it’s trying to read, and the gibberish it spits out is the encoding method’s “best guess” (for want of a better explanation) of what it sees. It’s not a perfect 1:1 of the actual binary in the file. Therefore, if you find the same characters and put them back in manually afterwards, it’s once again not a 1:1 match to what was there beforehand. There may be some characters that didn’t get rendered that got deleted as well which you have no way of re-entering yourself.
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