The UnregisterDeviceNotification function is included in Windows 98 and
later systems, including Windows 10, but not on earlier versions. On Windows 95 and Windows NT 4.0 the above error message is
displayed when WinUAE.exe tries to use this feature.
The version of WinUAE.exe which had this problem was included in some
versions of Amiga Forever 5.0. To solve the problem install the free
upgrade to Amiga Forever 5.1,
or a newer version.
Amiga Forever 2008 and higher do not support versions of Windows prior to