File Extension Changer .NET is a freeware tool for changing a file extension. Of course we can manually do this, this tool makes it very easy to change the extension of a file.
It integrates into the context menu, just right click on a file that you want to change extension, select ‘Change File Extension’ and enter the required extension and click on ‘Change and Exit’ button.
One thing you remember that changing a file extension should only be done if you are confident it's the right thing to do. Download File Extension Changer.Net