The Workbook button is enabled iff Microsoft Excel currently has an xls file loaded into memory. Please note that I said xls not xla.
If it does, then pressing the Workbook button brings the current active directory back to being the same as the directory into which the xls file is saved. "Wouldn't it already be there?" one might ask. The answer is not if you pressed either the "Parent" button or the "Cell" button and changed where the current active directory currently is. Think of the Workbook button as a kind of anchor for bringing the current active directory to the containing directory of the xls file you are working on right now. After it resets the current active directory it shows something like the following messagebox:
indicating that you've gone back to the anchor point.
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