The majority of eBooks are provided as EPubs, which have the file extension .acsm and need specific programs to read them. This is because they have more functionality and better Digital Rights Management than PDFs.

Adobe Acrobat Reader won't work with .acsm files and will give the follow error message:

"Adobe Acrobat Reader could not open this file because it is either not a supported file type or because the file has been damaged"

If you see this error message make sure you have Adobe Digital Editions installed - see our How do I download an eBook? FAQ and make sure that is the program being used to open the file.