[gui-talk] want to undo something

[Kenlawrence124 at aol.com]

Hi folks I'm sure you have run into a situation where you open a file and  
pick from a list of programs to open it and have to check or uncheck the 
always  use this program to open this type of file.  Well I ran into a 
situation  like that and forgot to leave that unchecked Several times when I have 
converted  a youtube song to an MP3 I have gotten it as a .MP3[1 and windows 
can't open  it.  I goofed and used Windows media center to do it but it can't 
do it and  that always use the selected program to open this file is 
checked.  So How  do I undo that since windows media center will open automaticly 
each time I try  to play that type of file.