Secure Socket Tunneling Protocol Service – SSTPSVC.DLL
Sstpsvc.dll installs with the Secure Socket Tunneling Protocol Service. Secure Socket Tunneling Protocol (SSTP) is a new form of (SSL-based) VPN tunnel with features that allow traffic to pass through firewalls that block PPTP and L2TP/IPsec traffic. This file is included in Vista Service Pack 1 and Windows Server 2008. You'll find more information at http://technet.microsoft.com/en-us/magazine/cc162322.aspx and at http://en.wikipedia.org/wiki/Secure_Socket_Tunneling_Protocol.
Safe
Microsoft