Solved! Go to Solution.
Are you able to post a copy of the DWG?
Another option is to try opening it in DWGTrueView, which may allow you to "convert" it to another format (such as DXF).
And, another option is to try inserting the DWG into another, empty DWG.
I have downloaded the DWG true view 2013 software. File didn't open in it.
But still I am unable to open the file in the browser, I have also tried to set the permissive mode, but still its not opening in the browser, its get downloaded, then opens in Recovery Toolbox for DWG.
You may check its free demo here: http://www.dwg.recoverytoolbox.com/
if you have back file for this one than change that into dwg & use it sure it will work