Actually, any workaround involving xwiki.properties can't work because XWiki fails to read it as well:
2026-04-06 13:07:20,453 [main] WARN o.x.e.i.ServletEnvironment - The resource path [/WEB-INF/xwiki.properties] is trying to access a resource outside of the resource root. It's expected to be located inside one of the allowed reallocations [D:\Win 10 Backup\LUCRU_D\TOMCAT_HOME 11.0.20 - 17.10.6 PostgreSQL\webapps\xwiki\\], but its real location is [D:\Win 10 Backup\LUCRU_D\TOMCAT_HOME 11.0.20 - 17.10.6 PostgreSQL\webapps\xwiki\WEB-INF\xwiki.properties]. If thisshould actually be an allowed location, you can add it to the property 'environment.servlet.allowedRealPaths' in the configuration file 'xwiki.properties'.
So there's no workaround in the end. Windows users will have to use / upgrade to 17.10.7.
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