Hello, I see that you can do "basic" formatting of boost::uuids::uuid via boost::format. This is good for basic formatting, but are there other format specifiers one can furnish? I'm thinking along the lines of formats such as with or without hyphens, etc. Or an ability to extend such a feature for that matter. See my C# WPF GuidGen for some examples: http://github.com/mwpowellhtx/guidgenwpf/tree/master/src/GuidGen.Wpf/Formats This is based on the Microsoft GuidGen, but using WPF technology, and with some additional formats. Thanks! Best regards, Michael Powell