In the "Boost Library Requirements and Guidelines Page" in the "Directory Structure and Filenames" topic, it says: 'The maximum length of directory and file names is 31 characters.' and the rationale is: 'We had to draw the line somewhere, and so the limit imposed by a now obsolete Apple file system was chosen years ago. It still seems a reasonable limit to aid human comprehension.' I do not think that there are any real OSs that impose such a limit anymore and would like to see this limit lifted. I have already hit this limit many times, especially in naming test files for my sandbox libraries. I would rather create filenames which described well what a file is about rather than have a 31 character limit for a filename, which is not only highly arbitrary, but almost certainly obsolete in this day and age.