title: How to tell WinINet to use IE's proxy server credentials
body: <p>In internet explorer i can set the proxy server. Then, when accessing the internet IE will prompt me for proxy credentials and optionally save them. New instances of IE pick up the credentials.</p>
  
  <p>I can also see the credentials are saved in the Credentials Manager, as a Generic Credential. The name follows a naming convention like Microsoft_WinInet_[proxyserver:port]/[proxyserver.acme.com].</p>
  
  <p>My app uses WinINet. We are currently setting the credentials via InternetSetOption with INTERNET_OPTION_PROXY_USERNAME and INTERNET_OPTION_PROXY_PASSWORD. </p>
  
  <p>But instead I want to tell WinINet to use IE's (or the Credentials Manager) credentials for the current user.</p>