Well this is a small SEO optimization post. Its been a while that i have been blogging but i never tried to optimize my blog for search engine results, as i din have the time to do that. But this is a small tweak and helps your blog to optimize for search engine results. You obviously have activated permalinks for your blog, well if no then please do activate it by going to settings>permalinks and choose the format you like.
Now if you want to, rather you should definitely add .html in your permanenet urls, then select the custom url pattern on the settings >permalinks page.
Then put a trailing .html in the custom input box like this.
All done sparky !!
But this custom structure wont work for pages, i guess. For that you need to use this plugin and activate it