I have noticed that changing the file extension from one to another and back to the old one will make the file unusable. Why is it so ? Does changing the extension change the file contents ?
Also, this can be noticed as changing the extension of .png file to .jpg works but it shouldn't since we are changing the extension. The binary data for .png should be meaningless as .jpg and vice versa.
Does Windows automatically try to change the file contents when the file extension is changed ?