saying words to the effect 'You better have a matching set of files'. I agree. And my point is that a user cannot know if the files are in fact "matching" unless you specify actual information about the files used to build. A random version string like "7.0.0" is not enough to technically verify. A checksum (ideal), a file size (good enough in practice), something that is specific to the actual content is needed. Otherwise it's just a guess. Regarding the name: I like unicode-letters.def. thanks, karl