@ shorena: Can't find those files anywhere, even not with a Recuva scan.
Not sure what that is, but if you checked the locations given on the multibit homepage for your OS and you have no other backup files I think your keys a very likely lost and thus your coins.
And you mean I can open the new wallet which I made in MultibitHD, in Multibit classic?
No, Multibit Classic does not work with the seed words, only Multibit HD does. You can essentially think of them as two completely different wallets.