now question is, how do I get back my history, extensions and so on. if anybody can help, please do.

Finally fixed it. Used a online tool and converted my bookmarks.bat into an html file, which finally worked. I feel so light now I could fly.

@leocg No. I can read the bookmarks I made in that file, but I don't get my bookmarks back

I'm fresh after a format. Before I did format my main drive I copied the contents of my Opera folders. I have the files for bookmarks, sessions, extensions etc, but opera does not help me in any way when it comes to reading them and getting all my data back. I tried to import them from those files but quite literally nothing happens.
When I open those files with text editor I can see all my bookmarks, so I know I have them. Please someone help me... I'm going crazy here...