/usr/lib/x86_64-linux-gnu/wine/libmf.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.
1 2 3 4 5 6 7 8 9 10 | ; File generated automatically from ./dlls/mf/mf.spec; do not edit!
LIBRARY mf.dll
EXPORTS
MFCreateMediaSession @42
MFCreateSourceResolver=mfplat.MFCreateSourceResolver @60
MFCreateTopology @63
MFGetService @75
MFGetSupportedMimeTypes @76
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