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How can I change a file default association for Thunderbird only? I accidently chose the wrong program. Windows default program is different.

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I right-clicked on an mp4 and chose the wrong program to associate with mp4's. Now it always wants to use THAT program. How can I change the association BACK to Windows MediaPlayer?

I right-clicked on an mp4 and chose the wrong program to associate with mp4's. Now it always wants to use THAT program. How can I change the association BACK to Windows MediaPlayer?

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right click slect "properties" at the bottom

up pops a dialog box


near the top it should say "Opens With" and there is a "Change" button.

If you don't see this, tell us what operating system you are running