If Excel keeps showing Want to save your changes message, uninstall Printer driver and change default printer to begin with. More suggestions here.

Excel's VALUE function has only one argument: where a is the value stored as text that you want to convert into a number.

You might want to open two files in two separate windows to compare them. Also, if you want to edit two files simultaneously, you need to open them separately. That is why you can change Notepad ...