There is only one file type that uses the .KES extension:
Kurzweil 3000 Document
Document created by Kurzweil 3000, a learning assistance application featuring text to speech for students that struggle with reading comprehension; saves a document that has been scanned into the program using OCR technology.
KES files can be highlighted and marked up with various note-taking tools. They may also be read back using Kurzweil 3000's text to speech feature.
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Updated: March 5, 2012