Attempting to open Source code of gmsv module

[Eprosync]

Hello, i recently came across an old gmod module called gmsv_bromsock_win32.dll
this allows the server to create tcp/udp, IRC and more connections

though since it's so dam old i'm trying to open it to modify it or simply make it work better than before.
for example being able to connect to C# tcp/udp clients and such.

So if there is anyway of opening this file i'll be happy to know.

Already tried:
Visual Studio - 2017 > Failed
JetBrain - dotpeek 2017 > Failed (says file isn't .Net Supported)
Haven't tried Hex yet but i'm afraid i might break it by using it.

[AtomiC]

You can't just "open up" compiled C++ code. It fails because you can't dotpeek a compiled C++ dll.

Here is the source code.
https://github.com/Bromvlieg/gm_bromsock

Here are alternatives to bromsock
https://gist.github.com/AbigailBuccaneer/5943024