In #7457 we added support for WinForms apps targeting Windows ARM64, but not WPF. A RID specific build/publish fails appropriately if UsingWpf is set (it claims that the WPF pack is not a valid framework reference). However, a RID agnostic WPF app successfully builds (be it on the ARM64 device itself or on a crossbuild), but will fail at runtime on ARM64. The shared framework on ARM64 doesn't have the WPF bits and will end up throwing a FileNotFound exception.