Just a quick note for those folks wanting to use the free tools located on the ICE website....the only "unusual" documents located there are the ICE Cards and Stickers created using the free Avery DesignPro 5 software that is available from Avery at www.avery.com .
In general, you wouldn't normally be able to open those files unless you first download the program that was used to create the document. You can later import those documents into a variety of other programs and convert them to PDF, JPG etc.
Programs used to create ICE documents are PowerPoint, MS Word, MS Excel, MS Publisher. Hope this helps.