Proxifier Socks4a leaks with Tor?

[echosblue]

Hi, I use a Windows program called Proxifier that routes all 
applications to connect to Tor. I find Proxifier very useful in allowing 
Tor to connect to proxies set in Firefox by an external program (Hide IP 
Platinum). I think it's easier than editing the Privoxy config to stick 
open proxies at the end of an exit node. My only concern with Proxifier 
is that Vidalia is giving me warnings about only receiving an IP address 
from Socks4. In Proxifier, I have entered IP:127.0.0.1 Port:9050 and 
have selected the Socks4a option. Why does Vidalia/Tor think I'm only 
using Socks4? Does anyone have experience with Proxifier? How does it 
resolve hostnames in Socks4a? Thanks.