There is only one file type that uses the .VNC extension:
VNC Configuration File
Contains settings for a Virtual Network Computing (VNC) connection from one computer to another; enables remote access to a system at a different location.
VNC settings files may include information such as the server address, data compression level, and encoding or encryption settings.
NOTE: UltraVNC automatically saves Last Viewer settings in a file named "latest.vnc." The file is typically stored in the user's "Local Settings" folder.
Updated: January 7, 2009