Last day I installed the audacious and it was associated with all of my applications even file open was associated with audacious, I have searched all around the internet but nothing changed.
I changed the file association in multiple files but nothing changed, actual problem was the caching.
So I simply edited the caching file
sudo gedit /usr/share/applications/mimeinfo.cache
and changed the line from
Saved the file and now files are opening by nautilus.
You can change any file association there.