User Guide

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Supported Unicode Ranges
TrueType and OpenType fonts must declare Unicode ranges that the font
can Support so that the operating system can decide which characters the
font can be used to represent. In TrueType format this information is
stored as the ulCodePageRange1 and ulUnicodeRange fields in the OS/2
table.
The Supported Unicode ranges dialog is relatively simple: you can see a list
of all Unicode ranges with a check box to the left of each name. If the check
box is checked it means that range is supported.
Buttons to the right of the list mean:
Uncheck all ranges.
Automatically check ranges using information about Unicode indexes
assigned to fonts characters.