How to remove .html from admin

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In my eyes the plugin is pretty useless because of two reasons:

  1. You can setup the permalinks on your own by adding .html to it. There is no need for the plugin.
  2. As Shahas Katta commented, there is genereally no need to have .html at the end of URLs.

As I don’t know your site nor your needs very well, it can be totally valid that you want to have .html at the end of most URLs on your blog. So point 2. is a bit subjective.