/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/ is in libreoffice-dmaths 3.4+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/AddonBarre.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/Choixrepinstallation.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/CloseAndLaunchOOo.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/CopyDmaths.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DialogStrings_de_DE.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DialogStrings_en_US.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DialogStrings_fr_FR.default
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DialogStrings_fr_FR.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DlgMajA.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DmOptions.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/DmProgInst.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/FinInst.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/Install_Addon.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/MajAuto.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/Options.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/RegisteredFlag
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/ToolLang.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/ToolsImages.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/Un_Install.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/dMessage.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/dialog.xlb
/usr/lib/libreoffice/share/extensions/DmathsAddon/DmInstall/script.xlb