Wow this has been very ueful information. If I want to copy the file (hero07.pax) and put it on another computer can I rename it e.g. danielcarter.pax? Or does it have to be "hero07.pax to run it?
Originally, Sacred came with an import/export function in the launcher menu. Unfortunately, the GOG version of the game does not use that launcher, so it doesn't have the ability to do that... I think I should ask the GOG guys why that is.
You can still import characters from players who have the original version of the game. All you need to do is get the exported "hero##.pax" file from them and place it in your save folder. Make sure it doesn't overwrite anything there; you might have to give it a different number, like "hero04.pax", but it can't be any higher than "hero07.pax". Then you just need to use the import function that is available when you start a new game and you can start using someone else's character.
EDIT - Apparently you can still export characters with the GOG version, I just never noticed where the option was. See my question thread
on the topic.