[XeTeX] Guaranteed Unicode replacement glyph in every TeX installation?

[Philip Taylor (HI)]

Ulrike Fischer wrote:

>
> With a current texlive you can use albatross to find out which fonts
> on your system support this
>
>     albatross -d 0xFFFD

I appreciate that this answer may have been targetted solely at Doug 
McKenna, but in the general case it does not work.  Here, using TeX Live 
2021 under Windows 7 Ultimate, the command "albatross" is unknown —

> Microsoft Windows [Version 6.1.7601]
> Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
>
> d:\Users\Philip Taylor>albatross -d 0xFFFD
> 'albatross' is not recognized as an internal or external command,
> operable program or batch file.
>
> d:\Users\Philip Taylor>


-- 
/Philip Taylor/
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