[XeTeX] Checking if a font exists

[Alan Munn]

Is there a way to check whether a font is present in a user's system?   
I need to generate a document with Myriad Pro if it exists, Arial  
otherwise, and if neither, exit with an error.

I couldn't find anything in either the fontspec and xetex documentation.
Thanks

Alan

--
Alan Munn
am...@gmx.com






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