[MlMt] Opening .eml files?

[Bill Cole]

On 4 Nov 2017, at 13:54 (-0400), Steven M. Bellovin wrote:

> Hmm -- are browsers special? Firefox knows when it isn't the default 
> browser.

Yes, in a sense.

The "default browser" is the default handler for URLs starting with http 
and https. The protocol handler settings are handled by one subsystem, 
the file extension to default opening app mapping is a different one.

That differentiation is an artifact of (pre-OSX) MacOS having a robust 
filetype+creator subsystem long before it had any TCP/IP support.