As I can only go by what the site claims, XnView should have no trouble viewing files with extensions dcm, acr, dic, dicom, and dc3, as well as 400 others, but those are the listed ones for DICOM. The repos have the latest current stable viewer, as well as the newest beta, available since March 30. Have you tried both?
Hello. Bad news, unfortunately - it seems I've survived. I'm back at home now, recuperating, kicking around the house, cursing at computers... I managed to completely mangle my main KDE installation today so far, and my little EeePC is not doing so well now either. I'll be beating on both of those shortly.
To answer your question though, Old-Polack: oddly enough, none of the DICOM files they gave to me have any extension at all - there are simply several score of them sitting in a directory named /DICOM, on the CDs; they're all numbered sequentially, starting at "1", and there are no extensions. Each individual file may be opened successfully in ImageMagick; it seems to 'recognise' them as DICOM files, although no other app does - and so far I do not yet understand how they may be viewed together properly as a set, to form a complete 3D model, as intended.
Please refer to the attached below, which indicates the files and directories found on one of the CDs (as well as depicting my current KDE4 problem):
From the information on the attached picture it appears that the individual files are stored in a manner that they need the proprietary Windows application to run them in the assembled 3D mode. If you have VirtualBox installed, and a Windows VM, the application on the CD should then be able to be run. Being as that application is a proprietary Windows application, with it's own internal formats, I doubt there will be any Linux application that would do the same, unless it comes from the same proprietary source as the Windows application.