title: Write to file that is open in Excel
body: <p>Suppose I have a program running that periodically adds information to a .CSV file.  Is there a way to write to the file while it is already open in Excel?  Obviously the changes wouldn't be noticed until the file was re-opened in Excel, but as it stands right now, I'm catching IOException and just starting a new .csv file if the current one is already open.</p>