quite some time has passed ... anyway ... I just tried the svn build #29356 (version 2.3 developer) and I have the same problem:
The procedure entry point freeaddrinfo could not be located in the dynamic link library WS2_32.DLL.
I am using Windows 2000 professional with the current updates and service packs (sp 4). My system has the ws2_32.dll in version "5.00.2195.6601" which seams to be from 1999. I just downloaded the version "5.1.2600.2180" and placed it in the installation directory which leaded to an other error:
The procedure entry point RtlIpv4StringToAddressW could not be located in the dynamic link library ntdll.dll.
My system has ntdll.dll in version "5.0.2195.7006" from 1999. I placed version "5.1.2600.2180" of the ntdll.dll from XP SP 2 into the ufo installation directory which didn't solve the problem. According to Microsoft (
http://msdn.microsoft.com/en-us/library/aa814458(VS.85).aspx) this function is included in the dll since Windows Server 2008 and Windows Vista.