/usr/lib/x86_64-linux-gnu/wine-development/libjsproxy.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 8 | ; File generated automatically from dlls/jsproxy/jsproxy.spec; do not edit!
LIBRARY jsproxy.dll
EXPORTS
InternetInitializeAutoProxyDll=JSPROXY_InternetInitializeAutoProxyDll @101
InternetDeInitializeAutoProxyDll @102
InternetGetProxyInfo @103
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