/usr/share/gconf/schemas/grace-thumbnailer.schemas is in grace 1:5.1.25-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61  | <gconfschemafile>
    <schemalist>
        <schema>
            <key>/schemas/desktop/gnome/thumbnailers/application@x-grace/enable</key>
            <applyto>/desktop/gnome/thumbnailers/application@x-grace/enable</applyto>
            <owner>grace</owner>
            <type>bool</type>
            <default>true</default>
            <locale name="C">
                <short>Enable thumbnailing of Grace Projects</short>
                <long>Boolean options available, true enables thumbnailing and false disables the creation of new thumbnails</long>
            </locale>
            <locale name="de">
                <short>Vorschaubilder von Grace-Projektdaien aktivieren</short>
                <long>Wahr (true) aktiviert die Erstellung von Vorschaubildern, während unwahr (false) das Erzeugen neuer Vorschaubilder deaktiviert.</long>
            </locale>
            <locale name="en_CA">
                <short>Enable thumbnailing of Grace Projects</short>
                <long>Boolean options available: true enables thumbnailing and false disables the creation of new thumbnails</long>
            </locale>
            <locale name="en_GB">
                <short>Enable thumbnailing of Grace Projects</short>
                <long>Boolean options available, true enables thumbnailing and false disables the creation of new thumbnails</long>
            </locale>
        </schema>
        <schema>
            <key>/schemas/desktop/gnome/thumbnailers/application@x-grace/command</key>
            <applyto>/desktop/gnome/thumbnailers/application@x-grace/command</applyto>
            <owner>grace</owner>
            <type>string</type>
            <default>grace-thumbnailer -s %s %i %o</default>
            <locale name="C">
                <short>Thumbnail command for Grace Projects</short>
                <long>Valid command plus arguments for the PDF Document thumbnailer.  See nautilus thumbnailer documentation for more information.</long>
            </locale>
            <locale name="de">
                <short>Das Vorschaukommando für Grace-Projektdateien</short>
                <long>Zulässiges Kommando plus Argumente für die PDF-Dokumentenvorschau. Bitte schauen Sie für weiterführende Informationen in der Dokumentation der Nautilus-Dokumentvorschau nach.</long>
            </locale>
            <locale name="en_CA">
                <short>Thumbnail command for Grace Projects</short>
                <long>Valid command plus arguments for the PDF Document thumbnailer. See nautilus thumbnailer documentation for more information.</long>
            </locale>
            <locale name="en_GB">
                <short>Thumbnail command for Grace Projects</short>
                <long>Valid command plus arguments for the PDF Document thumbnailer. See nautilus thumbnailer documentation for more information.</long>
            </locale>
        </schema>
    </schemalist>
</gconfschemafile>
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