» Opening/Closing a Workbook(s) in Excel 2007

To add a new workbook:

Press Ctrl+N.

To open a recently saved workbook:

Select File - > Recent Documents section.

To open a linked workbook:

Select the cell with the linked formula, and press Ctrl+[.
Or
1. Select Data -> Edit Links to Files dialog box (in Manage Connections Group)
2. Select the linked workbook and click Open Source.
 To prevent a macro from running while opening a workbook:
Press the Shift key while opening a workbook.

To close a workbook:

Press Ctrl+F4.
Or
Select File -> Close.