Thanxx a lot Terry.

Now , I had done it correctly.

Now, Would You please tell me, if I would like to save that file into a folder named as it's prefix inside the root directory "savefiles", then wht I have to do ? How and where  I can  create a directory ?

 

By the way, is there any problem to keep all the files(with prefix) inside a single directory ? or I  have to do whatever I thought above ?