Need to Change Permalinks

Dear Friends,

I am new to Blogger. Earlier i had a self hosted blog on wordpress.org. I decided to shift to Blogger as i didn't want to pay for hosting any more. My blog's url is http://www.harmanjits.com/

After importing the blog from wordpress to Blogger i am now facing a issue. The issue is the permalinks are now ending with .html while earlier there was no .html at the end of permalinks.

How can i do that because i am really worried that the incoming links will now show an error. Please help me out!

Regards,
Harman