How to undo the open with always

My friend forgot to un-check the always open with box while opening a file
And now his computer is all messed up, all the files open with media player.He tried to right click on the program and then open with and uncheck the always open with
but it didn't work.It just opened with media player when he clicked open with

Thanks inadvance

Hi, hopefully this will help you...

Open With - Add or Remove "Always use selected program"

This might help you How to reset default programs to open files?

Thanks for help guys :)

Hi and welcome to sevenforums fino1964, I suggest that you make new thread to avoid confusion for our experts, as this thread is already marked as 'Solved'