From iriver.com's plus page:
"Read new books every day
If you want to read books regardless of place, use the one supporting iriver¡¯s e-book. iriverplus3 e-book feature enables sending ¡°txt¡± extension files to the product. You will have another joy in your daily life by reading a book with the portable iriver product in a narrow space on your way to work. The iriverplus3 e-book feature only supports txt extensions,"
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