If you're working in Excel and you make a change to a cell that doesn't actually exist, you can still save your changes. To do this, simply select the cell that you want to change, then go to the File menu and choose Save As. In the Save As dialog box, select the location where you want to save your file, then click Save. Your changes will be saved even though they don't actually exist in the file.
Of course, if you try to open your file in Excel again, you'll get an error message saying that the file is corrupt. But as long as you have a backup copy of your file, you can simply ignore this error and continue working.
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