Win32 does support some limited fork()ing (I've used it in 2k without issues - 98 normally crashes though). What you will want to do is something like this:

my $child;
if ($child =fork()){
    #continue with prog
}
elsif ($child == 0){
    sleep 60;
    &code_to_exec;
}
else { die "Couldn't fork!" }
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See fork for more info