Steve If a user has an Professional or above (and the file has not been Owner-locked), the File > Export > Create Excel spreadsheet (Excel files only) or > Export data files (to choose CSV or many other data file formats to export) are both available.
If the user has a free Viewer, these options are NOT available UNLESS the file has been saved using a licensed enabling Enterprise Server Commercial Publisher installation, in which case these options WILL be visible and function in a free Viewer with enabled files.
This and other features of the Enterprise Server Edition is explained here:
A single Omniscope Enterprise Server Commercial Publisher for internal corporate reporting should cover all present and future Omniscope reporting flows within the organisation.