When I try to open a PDF file, I get an error that says the file cannot be opened.

Ebooks and some programs come with additional materials, such as a workbook, in the PDF format. If your program has no additional materials, then this answer does not apply to you.

You’ll need Adobe Acrobat Reader or another PDF reader program installed on your device to read the PDF files.

If you’re using a Windows computer, you can download and install this software for free by visiting Adobe's website.