This file is indexed.

/usr/lib/mysql-testsuite/r/perror-win.result is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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

The actual contents of the file can be viewed below.

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MySQL error code 150: Foreign key constraint is incorrectly formed
Win32 error code 150: System trace information was not specified in your CONFIG.SYS file, or tracing is disallowed.
OS error code  23:  Too many open files in system
Win32 error code 23: Data error (cyclic redundancy check).
MySQL error code 1062 (ER_DUP_ENTRY): Duplicate entry '%-.192s' for key %d
Win32 error code 1062: The service has not been started.
Illegal error code: 30000