'Declaration
 
Public Overloads Sub RegisterFileAssociations( _
   ByVal forCurrentUser As Boolean, _
   ByVal friendlyName As String, _
   ByVal defaultIcon As String, _
   ByVal openWithCmd As String, _
   ByVal ParamArray extensions() As String _
) 

public void RegisterFileAssociations( 
   bool forCurrentUser,
   string friendlyName,
   string defaultIcon,
   string openWithCmd,
   params string[] extensions
)

Parameters

forCurrentUser

Specifies whether the file associations should be registered in HKEY_CURRENT_USER, not in HKEY_CLASSES_ROOT which requires elevated privileges.

friendlyName

A friendly name for the data format, suitable to display to a user.

defaultIcon

The path to the default icon, such as, "systemroot\system32\imageres.dll,15".

openWithCmd

The command and arguments to be used when opening a shortcut to a document, such as, '"C:\Program Files\Paint.NET\PaintDotNet.exe" "%1"'.

extensions

The extensions to register, such as '.png'.

Reference

C1TaskbarButton Class
C1TaskbarButton Members
Overload List