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ettings. This keeps you from having problems with existing pages. Copy the contents from About.html and create a page called About Copy the contents of your other files and make pages with the exact same names. If your page names are different than the titles, you can edit the permalink to match the filename (without the html extension). Once the data is copied and you have the look you want, change the permalink to /%postname%.html For PAGES (Not POST) to use the HTML extension you need a plugin as WordPress only applies the Permalink structure to the posts. Recommended HTML Extension Plugin

Comprehensive guideline on landing page creation.