My vb class and my html file content in visual studio 2015 has been destroyed. Please help me : I have worked on my project in visual studio about about one html file and one vb file content are encrypted after closing solution.

I have check previews version of file and Visual Studio backup directory.

Both of above are empty. and my files are coded. 

My anti virus is NOD32 and it is updated recently.

[This is preview of encrypted file by Notepad++][1]

Please help me. 


  [1]: https://i.stack.imgur.com/3DSGE.png