This is very important and should be use first before making any post or commenting this help a lot in editing your post and replies.
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I don't think it's important at all. Moreover, I think most users don't use notepad app at all when writing their posts. There's no need, as the forum software already has a perfectly functional text editor.
OP, have you considered using a spell-checker instead? I believe it would be more beneficial in your situation.