/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/ is in libreoffice-dmaths 3.4+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Combobox.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/CouleurForm.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/CouleurForm.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Dialog1.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Dialog2.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Dialog3.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/InsereExpression.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Module1.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Module2.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Module3.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Module4.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Module5.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/RegisteredFlag
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/Textes.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/TextesForm.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/UtilAPI.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/_Historique.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/dialog.xlb
/usr/lib/libreoffice/share/extensions/DmathsAddon/OOoTep/script.xlb