how to create a Raw file[mp3,doc,jpg..etc] of any size with command prompt

create file with any size 

1. goto run >type CMD [run as administrator],

2. now after openin cmd prompt you have to type a simple command:

 "fsutil file createnew [filename] [size]"     without quotes

for example : i want create file .mp3 with size 1gb.
so command is

fsutil file createnew abc.mp3 1000000000
3.now press enter it will give u the location of file, which is c:\windows\system32.