If smooth scrolling is enabled (either globally or on the app in question), then not all application receives a high precision WMMOUSEWHEEL message (values other than 120 multiples) regardless whether that application can or cannot handle high precision WMMOUSEWHEEL messages. This can be reproduced if scrolling content under mouse is enabled, switching to an app that visibly supports this (like Firefox) and hover over on another application that can handle it (like Word, or the Windows Settings window).