Strange behavioural difference between vbscript and jscript using ADODB.stream in an HTA application - vbscript

Question

VBscript example:
Function ADO_WriteToFile(FileURL,data)
Dim arrBytes
SET ADObj = CreateObject("ADODB.Stream")
ADObj.Open
ADObj.Charset = "iso-8859-1"
ADObj.Type = adTypeText
ADObj.WriteText data
ADObj.SaveToFile FileURL, adSaveCreateOverwrite
ADObj.Close
ADObj.Open
ADObj.Type = adTypeBinary
ADObj.LoadFromFile FileURL
ADObj.Position = 3
arrBytes = ADObj.Read
ADObj.Position = 0
ADObj.SetEOS
ADObj.Write data
ADObj.SaveToFile FileURL, adSaveCreateOverwrite
ADObj.Close
End Function
JScript example:
function writeTo(fileName,str) {
var ado = new ActiveXObject("ADODB.Stream");
ado.Type = 2;
ado.Open();
ado.Position = 0;
ado.WriteText(str,0);
ado.SaveToFile(fileName,2);
ado.Close();
ado.Open();
ado.Type = 1;
ado.Position = 2;//line 19
var temp = ado.Read();
ado.Position = 0;
ado.SetEOS;
ado.Write(temp);
ado.SaveToFile(fileName,2);
ado.Close();
}
Why does the VBScript example work perfectly except for the fact that it can't accept file paths with space in them?
The JScript example errors out with the message "assignment to the parameter is incorrect." line 19. This doesn't happen if I set Position to 0 however:
ado.Position = 0;
i am using this to write binary files to disk btw

Answer 1

Here are some differences:
In the VBScript version, position is set to 3; in the JScript version, it is set to 2
In the VBScript version, the character set is defined; in the JScript version, it is undefined
In the VBScript version, WriteText and write both reference the argument; in the JScript version, only WriteText references it
References
Use vs Mention in JScript doesn't come for Free
JScript Data Types: Data Type Summary