Your URL file extension doesn’t matter. You can use .html, .htm, .asp, .php, etc. and it won’t make a difference as far as your SEO is concerned.

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screen-celebs.blogspot.com/ Top Pages indexed

.http://screen-celebs.blogspot.com/ - 2012/05/03
.http://screen-celebs.blogspot.com/2012/05/selena-gomez-trys-her-fame-in-new.html - 2012/05/03
.http://screen-celebs.blogspot.com/2011/08/selena-gomez-unlike-her-job-will-host.html - 2012/05/03