/usr/share/application-registry/xcas.applications is in xcas 1.2.3.57+dfsg1-2build3.
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 | xcas
command=/usr/bin/xcas
name=Xcas
can_open_multiple_files=true
expects_uris=false
requires_terminal=false
mime_types=application/x-xcas;
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