ActiveX in DCTs javascripts

Pria

Am trying to get the Size of file by using filesystemobject in javascript

var fso = new ActiveXObject("Scripting.FileSystemObject");
fileObj = fso.GetFile("file path on server/test.txt");
var test = fileObj.Size;

but its giving the following error-
"Automation server can't create object"

Another issue am facing is -
DOM parsing in DCT's javascript. ActiveX object gets created, but yet the element is not read. the same code works if run on the local m/c.