x86 asm with Notepad problem

Hi.I am learning new x86asm.I'm trying to run this code:
[code]
MOV AH,02
MOV DL,"!"
INT 21h
MOV AH,04Ch
MOV AL,00
INT 21h
[/code]

I'm saving Exam.asm with notepad in ANSI mod.After this file's extension .asm but file is txt file.