- 1). Open the folder that holds the files in which you want to clean up the file extensions.
- 2). Click on the tab in the folder that reads "Tools" and then select the "Folder Options" tool from the list.
- 3). Open the "View" tab in the Folder Options and then put a check next to the box by "Hide file extension for known file types."
- 4). Click the "Apply" button to affirm the changes and then click the "OK" button to close the window.
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