This just means you need to get a better operating system. You'll do one of a few things: alter YaBB to use native Win32 locking (not that I know how, I'm just suggesting it), move up to a Windows with POSIX capabilities (NT, Windows 2000, XP) or get a better operating operating system. You know the drill, OpenBSD, FreeBSD, NetBSD, Mac OS X, Linux, etc.
Don't be tempted to just uncomment the locking system. That's critical to preventing data corruption. Keep in mind that as long as you stick with crippled (no POSIX capabilities) operating systems like Windows 95, 98, ME your perl experience will be one frustration after another. I do the majority of my work on a Windows 2000 computer but that's augmented by a local Cygwin install and an OpenBSD server. If I had full choice of operating systems I might be using a FreeBSD desktop with Wine and/or VMWare to go windows-ish at need.
So go do something sane with your choice of new operating system.
__SIG__
use B;
printf "You are here %08x\n", unpack "L!", unpack "P4", pack
"L!", B::svref_2object(sub{})->OUTSIDE;
