[XeTeX] woff file

[maxwell]

We're getting a coredump from xelatex under certain circumstances.  It's 
reproducible for a given input file, but we haven't figured out a 
minimal file that will cause it.  My hypothesis at the moment (and this 
is about hypothesis #53) is that it's caused by an update I did recently 
from the SIL Scheherazade font version 1-something to the latest v2.100.

I was planning on uninstalling that version and going back to an earlier 
version, but I noticed s.t. odd.  If I take the .xdv output of xelatex 
and try to run xdvipdfmx on it, I get the following error (not a 
coredump, xdvipdfmx just exits after this error msg):
-----------
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xdvipdfmx:fatal: Cannot proceed without the font: 
/groups/tools/fonts/Scheherazade-2.100/web/Scheherazade-Regular.woff
-----------
And of course this filename appears in the .xdv file.

The .woff file in fact is there (along with the .ttf files), so I'm not 
clear why the error msg says it can't proceed without it.  But what I 
really don't understand is why it would want a .woff file in the first 
place.  My understanding is that .woff files are for web pages, not 
PDFs.

Also, I'm not clear how xdvipdfmx knows about the 
Scheherazade-Regular.woff file.  fc-list --verbose doesn't list any such 
fontfile, and I thought xelatex with the fontspec package just knew 
about whatever fontfiles fc-list knew about.

So my question is, is there any legitimate reason xelatex and xdvipdfmx 
should want a .woff file?

    Mike Maxwell