[XeTeX] Disable "mktextfm" and/or use of TFM-based fonts ?

[Philip Taylor (Hellenic Institute)]

Using XeTeX as my only TeX typesetting engine, I also use only OTF/TTF 
fonts.  After a faulty copy-and-paste, I found that I had inadvertently 
written :

> \font \fnf = \font \fb "Gill Sans MT" scaled 400
which led to the unexpected diagnostic :

> Usage: mktextfm [--destdir destdir] name
>
>
> ! Font \fnf= not loadable: Metric (TFM) file or installed font not found.
>
> <to be read again>
>
> \font
>
> l.441 \font \fnf = \font
>
> \fb "Gill Sans MT" scaled 400
>
As I /never/ want XeTeX to attempt to create a seemingly-missing TFM 
file, can I configure XeTeX and/or TeXworks to inhibit this undesired 
behaviour ?  And for that matter, can I configure XeTeX and/or TeXworks 
to inhibit any attempt to use TFM-based fonts ?

-- 
/Philip Taylor/

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