fileobject problem

I'm still getting a handle on TGB but I can't figure out writing a simple text file. I brought over code from TGE but when it executes, the file object returns true for opening the file but the file never shows up. Here is the little snippet I made, any ideas? I've read and searched the forums but can't find anything relevant.

function WriteTest()
{
%file = new fileobject();

%filename = "~/data/saves/test.txt";

%filename = expandFilename(%filename);

%ret = %file.OpenForWrite(%filename);

%file.WriteLine("test");

%file.close();
}