/usr/share/caja/extensions/libcaja-user-share.caja-extension is in mate-user-share-common 1.12.0-1.
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 | [Caja Extension]
Icon=user-share
Name=User Share
Description=Integrates with user-share
Copyright=Copyright (C) 2005 William Jon McCann <mccann@jhu.edu>
Version=1.12.0
Website=http://www.mate-desktop.org/
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