/usr/lib/mime/packages/vim-gui-common is in vim-gui-common 2:7.4.052-1ubuntu3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | text/plain; gview -f %s; edit=gvim -f %s; compose=gvim -f %s; test=test "$DISPLAY" != ""; priority=4
text/*; gview -f %s; edit=gvim -f %s; compose=gvim -f %s; test=test "$DISPLAY" != "" ; priority=2
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