There is only one file type that uses the .WCX extension:
RemoteApp and Desktop Connections Configuration File
Configuration file used by Remote Desktop Connection, a program included with Windows used to access computers remotely; contains setup information to bootstrap or install initial connection settings; often distributed within company networks when computers are setup or updated.
When you receive a WCX file, you can open it by double-clicking it. However, sometimes system administrators create scripts that "silently," or automatically, open the WCX file so that the user does not have to open it manually.
|Microsoft Remote Desktop Connection||Included|
Updated: November 23, 2010