It should be possible to provide localized strings to the Windows installer with jpackage.
WiX supports building localized installers through the use of language files that include localized strings. https://wixtoolset.org/documentation/manual/v3/howtos/ui_and_localization/make_installer_localizable.html There are three localization resources for Windows in jpackage. Though there is only one String in those three localization files, "message.install.dir.exist", all in English and there are more Strings in English in the main.wxs file that are not localized. MsiInstallerStrings_en.wxl MsiInstallerStrings_ja.wxl MsiInstallerStrings_zh_CN.wxl These could be customized by providing an application_en.wxl or application_es.wxl, or any other language to the resource directory. Perhaps also allow for further customization by providing an application.wxs to the resource directory to use instead of the main.wxs. /Sverre