This file is indexed.

/usr/lib/x86_64-linux-gnu/wine/libd3d11.def is in libwine-dev 3.0-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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; File generated automatically from ./dlls/d3d11/d3d11.spec; do not edit!

LIBRARY d3d11.dll

EXPORTS
  D3D11CoreCreateDevice @1
  D3D11CoreRegisterLayers @4
  D3D11CreateDevice @5
  D3D11CreateDeviceAndSwapChain @6