How to change any file format without any software in Windows XP

Today i am going to show that how to change any file format without any software in Windows XP.There are many softwares which converts file formats like FLV to AVI etc  and from TXT to RTF.It took time to install software and in converting file formats but there is very easy and simple trick in Windows XP to convert the any file format.To change the file format follow the steps given below:  

• Go to My Computer and Click on "Tools" on the top and then click on "Folder Options".
•  Click on "View" tab on the top of the window.

 

• Now untick the box of "Hide extensions for known file types".
• Now select any file type. I will select an rtf document file to change it into txt. There would written the type of the file after the name of it. for example I have saved a wordpad file and named it "File". Now there will be written "File.rtf". 
• Now click right click on the file and click rename and change the ".rtf" into ".txt" and save it. Now your formate is changed.