%

Thanks to all contributors for the highly informative
replies on  conversion:

        {extension} ==> (type, creator)

There's a lot of stuff I was not aware of!

Some relevant but unmentioned stuff I *was* 
aware of are:
 -- Netscape's own conversion mechanism.  
 -- InternetConfig database that Netscape and Apple 
do *not* use but others such as MacZip *do* use.

          Cheers

            Larry S