I'll just say: consider yourself very lucky to not having encountered it. (Especially if you've spent any time downloading random zip archives from the internet

I'll just say: consider yourself very lucky to not having encountered it. (Especially if you've spent any time downloading random zip archives from the internet...) I have quite a number of times. There's no one "thing"; it's usually some legacy app that write these names. And when you get a program that refuses to open any non-UTF16 compliant file name, you'll have a time of grief.