Weird... I did not have any issues with all of my craft files, but I've never had a 500++ parts file, so this does not have to mean something But on the other hand, I did not implement any lazy loading techniques, so it might become a problem if your craft becomes bigger. I will definitly fix that with the next version Ups... never intended to have any german words in that program But yes you are right, I'm native german and so it might become a problem if you run it on another language that is not capable of displaying a certain character set. Normally I always use UTF-8 to avoid that, but I would have to lie if I say I did in that project as well Anyways this should not cause any layout issues other than having those characters not being displayed. As I said in the previous post, it is not impossible but currently it seems to be a lot of work (specially a lot of file handling within the code as you have to parse every single part.cfg) So before not having fixed the performance issue with huge craft files, I'm not gonna implement such a feature as it would only increase loading times... Anyways it is already a planned feature and maybe I'll also associate the .craft extension to the program, so you will also be able to open craft files via your windows explorer Thanks :-) As I said, the original intention to write it was to get an overview of action groups which currently is not yet supported. But anyways, if I find some time to continue this project, it surely will become very usefull for quite a couple of reasons, not only getting a summarize of your action groups but also for building / manipulating craft files without having to run KSP itself