The HTML file that I want to edit opens in the wrong Office application

When you open a Hypertext Markup Language (HTML) or Web archive (MHTML) file from the Open dialog box on the File menu, the file opens in the program the file was created in. For example, if you attempt to open an HTML format file in Microsoft PowerPoint that was created in Word, the file opens in Word instead. To open an HTML file in PowerPoint that was created in another Microsoft Office program, right-click the file in the Open dialog box, and then click Open With, then click Microsoft PowerPoint on the shortcut menu.

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