About register a ActiveX Component from Install.js

Hello all.

I make a plugins for Netscape 7.0, but I use a activeX control and I
want install this too. But when I make a
File.windowsRegisterServer(xxx) that function return -208 "Invalid
Argument". I try to found the information about  how is the
"windowsRegisterServer" arguments, and don't found any information
about this. Pleace if any people have any sample or something.

That is a short  example of my install.js
...
err = addDirectory("", "1.0.0.1", "MyPlugins", pluginsFolder, "",
true);
logComment("addDirectory() returned: " + err);

var regComp = getFolder("Program") + "MyActiveX.dll";
err       = File.windowsRegisterServer(regComp);

if (err == SUCCESS)
{
 err = performInstall();
}
else
{
 cancelInstall(err);
}