/usr/share/mime-info/gnomecatalog.keys is in gnomecatalog 0.3.4.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | application/x-gcatalog
open=gnomecatalog %f
view=gnomecatalog %f
icon-filename=/usr/share/gnomecatalog/pixmaps/gcatalog.png
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