This file is indexed.

/usr/share/espeak-data/voices/mb/mb-de4-en is in espeak-data 1.46.02-0ubuntu1.

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

The actual contents of the file can be viewed below.

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name en-german
language en 9
gender male

voicing 130

mbrola de4 de4_phtrans