CSWA Exam guide files not opening

I have recently bought the Certified Solidworks 2008Associate CSWA Exam Guide (by David and Marie Planchard) inpreparation for sitting the CSWA exam in the next few months.

I am running SW2009 SP1.0 and get an unknown error message when Itry to open some of the files from the CD that arrived with thebook.

Some of the files on the CD, can be opened however with no problemand some say they have been created from an educational version.

Would be grateful for any ideas\ advice on what to do or if othershave had similar problems.

Thanks

Graeme SmithSolidworksAssemblies