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/usr/lib/x86_64-linux-gnu/wine-development/libd3d8.def is in libwine-development-dev 3.6-1.

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The actual contents of the file can be viewed below.

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; File generated automatically from dlls/d3d8/d3d8.spec; do not edit!

LIBRARY d3d8.dll

EXPORTS
  D3D8GetSWInfo @1
  DebugSetMute @2
  Direct3DCreate8 @3
  ValidatePixelShader @4
  ValidateVertexShader @5