I need to create a temporary file to store user settings on the client side. Is it possible to create a simple log file using JavaScript?
Try this anyway
var fso = new ActiveXObject("Scripting.FileSystemObject");
varFileObject = fso.OpenTextFile("C:\\Sachin.txt", 2, true,0); // 2=overwrite, true=create if not exist, 0 = ASCII
varFileObject.write("File handling in Javascript");
varFileObject.close();
http://www.codeproject.com/KB/scripting/JavaScript__File_Handling.aspx
But i dont think you have to do this type of experiments. You can create and do many file manipulations using server side languages.Thats better