/usr/share/nemo/actions/mount-archive.nemo_action is in nemo-data 2.2.4-2.
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 8 9 10 11 12 13 14 15 16 17 | [Nemo Action]
Name=Mount archive
Comment=Mount %f to browse its contents
Exec=/usr/lib/gvfs/gvfsd-archive file="%U"
Selection=s
Mimetypes=application/x-cd-image;application/x-bzip-compressed-tar;application/x-compressed-tar;application/x-tar;application/x-cpio;application/zip;
Stock-Id=gtk-directory
Dependencies=/usr/lib/gvfs/gvfsd-archive;
Selection=s
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