If you're doing spreadsheets, then it should show in a spreadsheet and not in an editor. It's like complaining that he can't edit jpegs in Sublime or something... there's a reason that's working poorly.

Speaking of which, last time I had a control code heavy file open in Sublime, it actually did show the control codes as special characters, and it was possible to copy/paste those. This proposal is so bad I suspect it will become a standard.