By default, in ofice 2007-2010, Excel files are opened in a same window in Windows. But sometimes you might want to view some files at the same time on your screen. To do this, you can start a new Excel process (excel.exe) by clicking the Excel button from the Start menu.
However, you can configure your computer to always open Excel files in separate windows. We recommend that you only use the method in this article when your computer has sufficient RAM.