To open an existing workbook in Excel, you can display the File menu on the menu bar, and choose the Open option (File->Open) to display the Open dialogue box.

 

 

You can also show the Open dialogue by pressing Ctrl + O, or by clicking on the File Open button in the standard toolbar. Once you open the dialogue box you can browse to a folder of your choice and double click on an Excel workbook to open it.

 

 

You can always tell what workbook you have open by looking at the file name in the Excel title bar.

 

Another option for opening workbooks is to use the recently used files list located near the bottom of the File menu. This list is also located on the Getting Started task pane.