I'd expect it to be looking at the fsType field in the OS/2 table:
I have found by otfinfo that http://www.bpdb.gov.bd/bpdb/images/fonthelp/Nikosh.zip has fsType = 0x0100 (No subsetting). Best, Akira -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
