There is a lot of C/C++ code out there that breaks with Windows unicode filenames, although most mature software projects don't just naively use fopen. Some C l

There is a lot of C/C++ code out there that breaks with Windows unicode filenames, although most mature software projects don't just naively use fopen. Some C libraries allow you to use UTF-8 filenames for all platforms and do the right thing internally, and I'm a big fan of that.