I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 91)

Section 8: Saving Documents
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To select a destination:
 Click the down arrow right of the Format and Destination
group, and select the format you want to add to the group.
Example: Show DOCX export format. The corresponding button
will be added to the toolbar.
 Double-click the required format on the Format and
Destination group to access its options:
 Then select the destination of your choice.