/usr/share/applications/setup-mozc.desktop is in mozc-utils-gui 2.20.2673.102+dfsg-2.
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 | [Desktop Entry]
Name=Mozc Setup
Name[ja]=Mozc の設定
Comment=Set up Mozc engine
Comment[ja]=Mozc エンジンを設定します
Exec=/usr/lib/mozc/mozc_tool --mode=config_dialog
Icon=/usr/share/icons/mozc/ime_product_icon_opensource-32.png
Type=Application
StartupNotify=true
Categories=Settings;
X-Desktop-File-Install-Version=0.23
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