Hello!

I'm migrating a project from libcurl to Beast. I'm trying to compile http_client_async.cpp, but 110 errors come from "file_win32.ipp" and "file_win32.hpp", mostly missing declarations and members. I'm using Visual Studio 2017 (warning level 4). Here is what I have done:

1. Downloaded and set up boost 1.65.1 according to the "getting started" tutorial
       - Built all binaries
       - Verified header only example and binary-dependent example
2. Downloaded beast/include/boost from GitHub and moved the folder and .hpp to 
       - C:\Program Files\boost\boost_1_65_1\boost
3. Started an empty project and pasted in the http_client_async.cpp example.

I have spent too many days trying to get this up and running. Any help would be greatly appreciated!

Kind regards