This file is indexed.

/usr/lib/x86_64-linux-gnu/wine/libd3d9.def is in libwine-dev 1.8.7-2.

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/d3d9/d3d9.spec; do not edit!

LIBRARY d3d9.dll

EXPORTS
  Direct3DShaderValidatorCreate9 @1
  D3DPERF_BeginEvent @4
  D3DPERF_EndEvent @5
  D3DPERF_GetStatus @6
  D3DPERF_QueryRepeatFrame @7
  D3DPERF_SetMarker @8
  D3DPERF_SetOptions @9
  D3DPERF_SetRegion @10
  DebugSetMute @12
  Direct3DCreate9 @13
  Direct3DCreate9Ex @14