How To remove the window in the common extensions should I do?

Inquiry courtesy of Yen: How do you remove common extensions on windows?

I have windows 7. I would like to know where the option there is to remove common extensions like .wma and .mp3 but keep the lesser known ones like .7z. I know there was a way to do that.

I want it so that I can still alter extensions when I want to, but for the common ones, they could be hidden so that it reads “test” instead of “test.mp3″

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Most practical answer:

Answer by peteams

Assuming 7 is the same as 8, find the Folder Options property page, on the View tab under Advanced settings put a check mark next to ‘Hide extensions for known file types’.

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How To remove the window in the common extensions should I do?