This file is indexed.

/usr/lib/grub/x86_64-efi/partmap.lst is in grub-efi-amd64-bin 1.99-21ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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part_acorn
part_amiga
part_apple
part_bsd
part_gpt
part_msdos
part_sun
part_sunpc