This file is indexed.

/etc/freeradius/3.0/certs/xpextensions is in freeradius-config 3.0.16+dfsg-1ubuntu3.

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

The actual contents of the file can be viewed below.

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#
#  File containing the OIDs required for Windows.
#
#  http://support.microsoft.com/kb/814394/en-us
#
[ xpclient_ext]
extendedKeyUsage = 1.3.6.1.5.5.7.3.2
crlDistributionPoints = URI:http://www.example.com/example_ca.crl

[ xpserver_ext]
extendedKeyUsage = 1.3.6.1.5.5.7.3.1
crlDistributionPoints = URI:http://www.example.com/example_ca.crl

#
#  Add this to the PKCS#7 keybag attributes holding the client's private key
#  for machine authentication.
#
#  the presence of this OID tells Windows XP that the cert is intended
#  for use by the computer itself, and not by an end-user.
#
#  The other solution is to use Microsoft's web certificate server
#  to generate these certs.
#
# 1.3.6.1.4.1.311.17.2