Gdb on Windows fails to read coredump

Prebuilt ARM toolchain for Windows (gcc-arm-none-9-2020-q2-update) fails to read coredump file.

Error: "no core file handler recognizes format".

Same toolchain version on linux is able to read coredump.

Refer to arm-linux-tdep.c: (which has corefile support)

  /* Core file support. */
  set_gdbarch_iterate_over_regset_sections
    (gdbarch, arm_linux_iterate_over_regset_sections);

Detailed log/output:
====================

arm-none-eabi-gdb rom.elf -c Coredump

C:\Program Files (x86)\GNU Arm Embedded Toolchain\9 2020-q2-update\bin\arm-none-eabi-gdb.exe: warning: Couldn't determine a path for the index cache directory.
GNU gdb (GNU Arm Embedded Toolchain 9-2020-q2-update) 8.3.1.20191211-git
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Reading symbols from rom.elf...
"Coredump": no core file handler recognizes format
(gdb)