/usr/share/cups/drv/indexbraille-filter.defs is in printer-driver-indexbraille 1.2.2-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | // Raw files, i.e. no processing required.
Filter application/x-idx-doc 0 -
Filter application/x-idx-fw 0 -
// Index-direct-Braille files, i.e. needs a header and processing (escaping).
Filter text/plain 0 index-braille.sh
Filter application/pdf 0 index-direct-braille
Filter application/msword 0 index-direct-braille
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