As an export to Excel is not possible from the Viewer, users are forced to select the records from a Table or from the Details view and copy and paste to Excel. This is acceptable for most of them, except for the fact that the fieldnames cannot be copied resulting in an Excel table without a header row.
Arjan - yes...a Enterprise Server Commercial Publisher Edition can save your files enabling export of user-selected data to Excel from an installed free Viewer (and also export to CSV from an Omniscope Online Java Web Start-deployed free Viewer)... you just need to upgrade your publishing edition.