[Wine] How to install 64bit softwares in Wine

[Imran23]

Hi, I am using Wine1.3.28 in linux 11.04 (64bit OS)
I installed Wine along with all the 32bit libraries and I read that using 64bit windows apps are still experimental in Wine.
I found this page which might help http://wiki.winehq.org/Wine64
But, since I am new to linux and all, I am sort of confused about what I'm actually supposed to do..
First of all how do I know if I am using an up-to-date GCC? Also, how do I run a shell script?
Secondly, it asks me to configure wine for 64-bit compilation and I'm pretty sure you can't do that in terminal :P... So, I'm kind of lost now..

Here is an example of what happens when I try to install a 64-bit windows application (iTunes in particular)

> 
> imran at imran-desktop:~$ cd ~/Desktop/
> imran at imran-desktop:~/Desktop$ wine "iTunes64Setup.exe"
> err:process:create_process starting 64-bit process L"Z:\\home\\imran\\Desktop\\iTunes64Setup.exe" not supported in 32-bit wineprefix
> wine: Bad EXE format for Z:\home\imran\Desktop\iTunes64Setup.exe
>