This file is indexed.

/usr/lib/grub/i386-xen/partmap.lst is in grub-xen-bin 2.02~beta2-22+deb8u1.

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_dfly
part_dvh
part_gpt
part_msdos
part_plan
part_sun
part_sunpc