Open method as it applies to the Workbooks object.  
 
Opens a workbook.  
 
expression.Open(FileName, UpdateLinks, ReadOnly, Format, Password, WriteResPassword, IgnoreReadOnlyRecommended, Origin, Delimiter, Editable, Notify, Converter, AddToMru, Local, CorruptLoad)  
expression    Required. An expression that returns the Workbooks object.  
 
FileName   Required String. The file name of the workbook to be opened.  
 
UpdateLinks   Optional Variant. Specifies the way links in the file are updated. If this argument is omitted, the user is prompted to specify how links will be updated. Otherwise, this argument is one of the values listed in the following table.  
 
Value Meaning    
0 Doesn't update any references    
1 Updates external references but not remote references    
2 Updates remote references but not external references    
3 Updates both remote and external references    
 
If Microsoft Excel is opening a file in the WKS, WK1, or WK3 format and the UpdateLinks argument is 2, Microsoft Excel generates charts from the graphs attached to the file. If the argument is 0, no charts are created.  
 
ReadOnly   Optional Variant. True to open the workbook in read-only mode.