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As attached file, a small reproducer for a bug in impi on Windows.
When the file name contains a '/', impi runs out of communicators with MPI_FILE_OPEN/MPI_FILE_CLOSE sequences.
Intel(R) Fortran Intel(R) 64 Compiler Classic for applications running on Intel(R) 64, Version 2021.10.0 Build 20230609_000000
Intel(R) MPI Library for Windows* OS, Version 2021.14 Build 20241121
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thank you for reporting this, we implemented a fix which will be included in the next release, Intel MPI 2021.15, which will be part of oneAPI 2025.2

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