/usr/share/applications/mkvmergeGUI.desktop is in mkvtoolnix-gui 7.3.0-1.
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 | [Desktop Entry]
Type=Application
Name=mkvmerge GUI
GenericName=MKV files creator
GenericName[de]=MKV-Dateien erstellen
GenericName[es]=Creador de ficheros MKV
GenericName[fr]=Créateur de fichiers MKV
GenericName[zh_CN]=MKV 文件创建器
GenericName[zh_TW]=MKV 檔製作軟體
Icon=mkvmergeGUI
Exec=mmg %F
Terminal=false
MimeType=application/x-mmg-settings;video/x-matroska;audio/x-matroska;
Categories=GNOME;AudioVideo;AudioVideoEditing;
InitialPreference=-5
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