Windows 3.1 users note !

POV-Ray for Windows 3.1 no longer supports Win32s. Sorry folks, but the
writing was on the wall. Our development tools now offer very little
support for it, Microsoft hasn't released a bug fix for it for several
years (!), and having Win32s compatibility in has made adding new Win32
features more complicated that it needed to be.

So it's gone. If you want to run POV under Windows 3.1, please use POV 3.1
for MS-DOS, or continue using POV-Ray version 3.02.