This file is indexed.

/etc/sane.d/microtek.conf is in libsane-common 1.0.25+git20150528-1ubuntu2.

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

The actual contents of the file can be viewed below.

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# Uncomment following line to disable "real calibration" routines...
#norealcal
# Uncomment following line to disable "clever precalibration" routines...
#noprecal
#   Using "norealcal" will revert backend to pre-0.11.0 calibration code.
scsi * * Scanner
/dev/scanner