/usr/share/wine/gecko/wine_gecko-2.21-x86_64.msi is in wine64 1.6.2-20.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/wine/gecko/../../wine-gecko/wine_gecko-2.21-x86_64.msi
/usr/share/wine/gecko/../../wine-gecko/wine_gecko-2.21-x86_64.msi