We periodically see cases where the path string provided to Path.of includes the long path \\?\ or \\?\UNC prefix. This can arise with strings provided by a native application.

The JDK will automatically add the prefix when accessing a file with a long path so the prefix is not needed; it is otherwise is out of sight and not something exposed to Java code. At this time, if code calls Path.of with a string that has this prefix then the input will be rejected. We should consider changing this to allow the input, adjust the prefix, and don't parse or retain it.