Nothing in HDF5DataFile.cpp uses sys/stat.h (no stat/mkdir/S_* etc.); it relies
on <filesystem>. Removing the dead POSIX include also avoids a needless
non-portable header for the eventual MSVC build.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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