Thanks David, you confirmed what I understood. Curious though as to how you managed to get FS reader to appear within your open with choices. I wasn't sure where to find it when looking to make it to the default program and Sight and Sound weren't able to help - they said it was not possible to do it that way and that I should open it from within the Reader. Peter From: access-uk@xxxxxxxxxxxxx [mailto:access-uk@xxxxxxxxxxxxx] On Behalf Of David Griffith Sent: 10 February 2015 23:29 To: access-uk@xxxxxxxxxxxxx Subject: [access-uk] Re: DAISY book construction. Generally the existence of smil files and NCC.html is a indication that this is a Daisy Book. What I do to check the integrity of the book is to test it in the Free PC FSReader app which is bundled with Jaws. As long as you have installed a Jaws version, even in 40 minute demo mode you will have access to FS Daisy reader. It works fine with NVDA for example. I use the open with dialogue on NCC.html file and point it at FS Reader. If this loads the book ready for reading in FS Reader you will have the legitimate Daisy status confirmed. David Griffith On 10 Feb 2015, at 11:58, Peter Bentley <bentleypdlists@xxxxxxxxxxxx> wrote: A strange question perhaps but looking at the contents of a book folder how would you determine whether it was or was not a daisy BOOK? Putting it another way, if it contains .smil files and an ncc.html file along with mp3 files, would it not be a DAISY book? I ask this because it is being suggested that a particular book of this construction will not read within the Go Read app because it is an MP3 book. Peter