Jim,
The SaveAs Invoke Node is an activeX method. Since this one is related to Excel, all help on the methods and properties for Excel is created by Microsoft. To be able to access help by right-clicking on methods and properties, you have to have Microsoft's VBA (Visual Basic for Applications) installed. It can be installed with the application you need help on, in your case Excel.
You can get all the FileFormat parameters for your Workbook with the FileFormat property node. Wire a property node to the output of Workbook open and the output is a Text Ring, so it displays the names and not numbers for different formats. You can select to view the Digital Display on this indicator, and it will show you the appropriate number. For example, -41 is -4143
is "xlWorkbookNormal". The "xlTextWindows" has number 20 associated with it.
The attached document has the help description that I got for SaveAs method and FileFormat property node. You may be able to get more information on these from the Microsoft's web site.
Zvezdana S.
National Instruments