Migrating the KDE configuration files

I'm a KDE user, and When I switch Linux distributions, I don't want to copy my entire home folder, since most of the configuration files there will be created automatically when I install\run programs on the new installation. There are, however, some applications that I've put a lot of work into their configuration, and I like to hand-pick their configuration files that I want to migrate to the new installation. Now, I'm having trouble doing that with the KDE configuration itself - I can't find my way around the .kde and .kde4. I don't want to migrate the entire folder - but I need some specific settings from there. So, the question is - what do I need to do to migrate the following KDE settings: - File associations - Activities That's it. I need a way to migrate those - be it copying specific files, copying parts of files, or using a tool. Thanks in advance!