I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 106)

Chapter 14 – Recognizing large volumes of scanned images
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These folders may be different but do not need to be.
 Click the Text Format button to select the required external file
format and its options.
For more information on the formatting options, see the chapter
Formatting and saving documents.
 Select the processing options:
o Select Process subfolders to process all subfolders of the
image folder. If the output folder differs from the image
folder, all subfolders will be recreated in the output folder,
mirroring the structure of the image folder.
o Select Overwrite text files to overwrite previous
recognition results.
o Select Delete scans after recognition to delete the files in
the image folder.
 Click OK to execute the recognition.
Readiris processes the images of all supported file formats. You
cannot limit the OCR to files of a specific file format.