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Reiner Steib <4.uce.03.r.s@nurfuerspam.de> writes:

> Here's another patch, allowing additional regexp and function values
> for `mm-enable-external':
>
> +If `mm-enable-external' is a function, that function is called with
> +three arguments: the MIME type, the method and the filename for
> +this MIME handle.  The external MIME handler is invoked, iff this
> +function returns non-nil.
> +
> +If if `mm-enable-external' is a regular expression, the external
> +MIME handler is invoked, iff the MIME type is matches the
> +expression."

I don't understand the purpose.  This is exactly what mailcap is
intended to do -- that is if you don't want to invoke an external
viewer for some MIME type, then edit your .mailcap file to reflect
that preference.