/usr/lib/mono/4.0/dmcs.exe.config is in mono-dmcs 2.10.8.1-1ubuntu2.3.
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 | <?xml version="1.0"?>
<configuration>
<startup>
<supportedRuntime version="v4.0.30319"/>
</startup>
</configuration>
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