According to this link: http://appdb.winehq.org/objectManage...rsion&iId=2893
, you can use metatrader4 with wine but you need some dlls copied from windows to install it.
So your options are:
1/ find a friend who has windows installed and get the dlls from him, or from any computer running Windows.
2/ temporarily install Windows on your machine in order to get the dll. You can do that in a virtual machine like Virtualbox or qemu.
3/ Just install Windows in a virtual Machine (Virtualbox or qemu or vmware) and use it in the virtual machine.
4/ Install windows in a separate partition and dual boot it to run Metatrader