/lib/udev/rules.d/50-compat_firmware_23_generic.rules is in linux-backports-modules-cw-3.3-3.2.0-23-generic 3.2.0-23.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # do not edit this file, it will be overwritten on update
# compat_firmware_23_generic-class requests, copies files into the kernel
SUBSYSTEM=="compat_firmware_23_generic", ACTION=="add", RUN+="compat_firmware_23_generic.sh"
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