Web Filtering Proxy for Microsoft Windows is a web filtering proxy and secure web gateway for Microsoft Windows. It can decrypt HTTPS traffic, filter HTTP requests and responses and inspect contents of HTML pages. The product deployed as a network service in Microsoft Windows and is managed by using Microsoft Management Console.
As of https://www.openssl.org/docs/man3.0/man3/SSL_clear_options.html - search for SSL_OP_LEGACY_SERVER_CONNECT.