version: boost 1.81.0 compiler: msvc 193 and apple-clang 13 <img width="1630" alt="image" src="https://github.com/boostorg/process/assets/2892107/c8ef0b22-1d13-4ebd-b7b8-9ce72aa4549f"> when BOOST_PROCESS_USE_STD_FS is not defined, it's okay.