You can change which program launches when you open an image or play a movie file within Maya. For example, when you select 
		Windows > Playblast to create a movie. 
	 
To specify your own default image or movie viewer
- Select 
		  Windows > Settings/Preferences > Preferences, then select the 
		  Applications category. 
		
- In the 
		  Applications preferences, enter the path to the desired program for each file type listed, or browse to point to the application executable file by clicking the folder icon.