Here is my Interface.xml file:
<Interfaces xmlns="urn:msgplus:interface" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi

chemaLocation="urn:msgplus:interface
C:\PROGRA~1\MESSEN~2\Scripts\PlusInterface.xsd">
    <Window Id="WndTest" Version="1">
        <Attributes>
            <Caption>Test Window</Caption>
        </Attributes>
        <TitleBar>
            <Title>
                <Text>Hello!</Text>
            </Title>
        </TitleBar>
        <Position Width="180" Height="75"/>
        <DialogTmpl/>
        <Controls>
            <Control xsi:type="StaticControl" Id="LblTop">
                <Position Left="10" Top="10" Width="150"/>
                <Caption>Hello world!</Caption>
            </Control>
            <Control xsi:type="ButtonControl" Id="BtnClose">
                <Position Left="112" Top="25" Width="50"/>
                <Caption>Close</Caption>
            </Control>
        </Controls>
    </Window>
</Interfaces>
Here is my Script:
function OnEvent_Initialize(MessangerStart) 
{ 
    var Wnd = MsgPlus.CreateWnd("Interface.xml","WndTest");
}
When I run it nothing happens, when I replace the Interface.xml with another file from someone elses script and change the window IDs the window opens... I need help. Note that the file is called Interface.xml