/usr/lib/x86_64-linux-gnu/wine-development/libsxs.def is in libwine-development-dev 3.6-1.
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 | ; File generated automatically from dlls/sxs/sxs.spec; do not edit!
LIBRARY sxs.dll
EXPORTS
CreateAssemblyCache @1
CreateAssemblyNameObject @2
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