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I cannot open my e-book course manual.

If you have downloaded the course manual e-book into your computer or mobile instead of a physical e-book reader such as Kindle, Nook, Kobo, etc. you will need e-book reader software to open it. Google search for "the best free e-book reader" will offer many good choices.

FII e-book publications are provided in .epub format with soft "soft DMR" that allows e-books to transfer between the student's devices. However, it makes it traceable to the owner in the case of illegal distribution.