/usr/lib/yaws/yapp/ebin/yapp.app is in yaws-yapp 1.98-2.
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 | {application, yapp,
[{description,"Yaws applications handler"},
{vsn, "0.4.2"},
{modules,[yapp, yapp_app, yapp_sup, yapp_handler, yapp_server, yapp_registry, yapp_mnesia_server, yapp_event_handler, yapp_ets_server]},
{registered, [yapp_handler]},
{mod,{yapp_app,[]}},
{env, [{yapp_registry_impl, yapp_mnesia_server}]},
{applications,[kernel, stdlib, yaws]}]}.
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