This setting is only applicable if Allow Instance List to be sent to MS-Excel is checked. This contains the prefix that is used to construct the name of the Comma Separated Variable (CSV) file produced when the end-user sends the instance list to MS-Excel.
The file is created in the user's temporary directory, with a name of:
<<Prefix>>_<<Current date/time>>.csv
This property is in the Business Object Instance List tab.