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How do I get jscript code processing to run?

var a, ad, f, gf, so;
var so = new ActiveXObject("Scripting.FileSystemObject");
var gf = so.GetFolder(so.GetParentFolderName(WScript.ScriptFullName)); 

// StreamTypeEnum
var adTypeBinary = 1; // binary
var adTypeText = 2; // text

// 読み込み方法
// StreamReadEnum
var adReadAll = -1; // all lines
var adReadLine = -2; // per line

// 書き込み方法
// StreamWriteEnum
var adWriteChar = 0; // paragraph
var adWriteLine = 1; // not paragraph

// how to save 
// SaveOptionsEnum 
var adSaveCreateNotExist = 1; // make new one
var adSaveCreateOverWrite = 2; // overwrite

//var cwd = fso.GetParentFolderName(WScript.ScriptFullName);
var cwd = so.GetParentFolderName(WScript.ScriptFullName);
//var wscPath = fso.BuildPath(cwd, "vbsWrapperformoodle.wsc");
var wscPath = so.BuildPath(cwd, "vbsWrapperformoodle.wsc");

var vbs = GetObject("script:" + wscPath);
var InputBox = vbs.method_InputBox;

//user enter
var strRepl;
var strWith;

//using InputBox with one WSC file
strRepl = vbs.InputBox("Type letters before change.", "Inputbox");
if (!(strRepl)) {

strWith = InputBox("Type letters after change", "Inputbox");
if (!(strWith)) {

for (fileobj in gf.Files)
        // read
		var sr = new ActiveXObject("ADODB.Stream");
		sr.Type = adTypeText;
		sr.charset = "utf-8"; //Shift_JIS
		var temp = sr.ReadText(adReadAll);

		// write
		var sw = new ActiveXObject("ADODB.Stream");
		sw.Type = adTypeText;
		sw.charset = "Shift_JIS"; ///utf-8
			temp.replace(new RegExp(strRepl, "g"), strWith)
	    sw.SaveToFile(fileobj, adSaveCreateOverWrite);

gf = "";
so = "";

The for statement "for (fileobj in gf.Files){}"does not pass the process.
"WScript.Echo(gf. Files.Count);" displays the number of files in the folder and only the "Done" message is displayed.
Even if I try to change the code "for (fileobj in gf.Files)" like "for (gf.Files.Item in gf.Files)", it doesn't work. Can someone please tell me?

What I have tried:

I tried "gf.Files.Item" instead of "filename".
JScript doesn't have a "foreach" statement, so I don't think it's wrong in the form for(a in b){}.
But no success.
I'm in trouble because I don't have anyone around to ask.
Please help me.

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