Visual Studio is opening web page in notepad

Question

I was working on webpage (Chat.aspx) accidently my system got shutdown. Now my visual studio opening webpage in notepad which is empty(showing nothing).

I also trie

Answer 1

I recently faced this issue working in VS 2010 and I was breaking my brain. Luckily I had source control, so to solve the issue I manually deleted it the file and got latest version.