Exult is a substitute engine that was written a long time ago and has been maintained over the years that plays Ultima VII(Black Gate and Serpent Isles) with no hassle and contains features that enable you to enhance the game with downloadable midi packs and graphic updates.

http://exult.sourceforge.net/

Try it out, probably better than dosbox anyways.

I was going to point this out because I found this today, but thank god I did a search.
Most hardcore players must know about this anyway, but hey, this is intended to help new players, who are an important part of GOG community, as they make it grow.

Try it out, it's really nice, and it's also very easy to setup. Just install it, point where you installed the Ultima VII package, et voilá, you're ready to go :)

and be careful of the missing items bug

Wow, I am really impressed ... Ultima VII is fascinating, and Exult maxes it out :-) Just bought U7 at gog, installed Exult and I am ... touched ... it is awsome!
Just one question: How can I see that this missing items bug occured, there are so many items ...
I am saving every single progress to another savefile, are there other good tips?

You'll see it when you need a specific item (such as a key) to access something and you KNOW you picked it up, but it is no longer there.

So save often in new slots. Also, I have been told that the bug is either not there or at least significantly less if you use one of the 1.2 builds rather than the current 1.4 build. Of course, 1.2 has a few less things than 1.4, but from what I remember its not too noticable.

Thank you, I will just check version 1.2. I just started the game, and at the moment there is no loss ...