Jeroen DOnker's User Tip (see latest User Tips) for having NWC files interpreted by your Internet Service Provider as MIME type application/nwc works wonderfully!
If you configure NetScape (or IE) to use Noteworthy Player as a Helper Application for files of MIME type application/nwc, you will then have automatic playing of NWC files from your browser!
So I strongly suggest that we set a worldwide standard and urge our webmasters to configure their websites so that NWC files are all interpreted as MIME type application/nwc
Andrew
Thanks again Jeroen for the last piece to finish the puzzle.
See also: https://forum.noteworthycomposer.com/?topic=13.msg4400#msg4400