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 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.