Use these settings to specify the options for associating extensions and MIME types with a program so that the appropriate program starts when a user clicks a link. To create a new association, click New. To remove an association, click Delete.
AssociationsDescriptions
Extensions
MIME Type
Type the MIME (Multipurpose Internet Mail Extensions) type to associate with this extension. A MIME type enables a browser to differentiate between different file types using a type designation, rather than a file extension.
Command Line
Type the command line or program that you want to execute when a file is opened or a link of this type is clicked. If a script is placed into the <install_dir>/bin directory, you do not need to include path information. You should include the program name, followed by a space, and %1—for example, netshow %1.
Here's a mapping example, which enables Microsoft NetShow to run when users click an .asf or .asx file:
Description: Netshow