/usr/lib/x86_64-linux-gnu/qt4/imports/Qt/labs/folderlistmodel/qmldir is in libqt4-declarative-folderlistmodel 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | plugin qmlfolderlistmodelplugin
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