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I have a fairly complex workflow associated with a library of Excel files. I need to be able to add a time stamp to the bottom of the file when the workflow is finishing up.
Most of my previous experience with editing Excel files is querying via a Odbc connection. As far as I can see, there isn’t a built-in Sharepoint ability to do so. I don’t have file system access to just write the file to a temp location on disk. I don’t know of any way to edit the Binary Stream that Sharepoint provides.
You could use the OOXML SDK to edit the binary stream of the Excel file and set that time stamp.
Take a look at OpenXML Developer.