Packaging an add-in for distribution
A Microsoft Expression Web extension package is just a renamed .zip file that contains all the files used by the extension.
Structuring the package
All of the components of an add-in must be included within a single folder before you can create a redistributable package. Although assets for the add-in may be organized in subfolders, those subfolders must also reside within the add-in folder.
The manifest file, addin.xml, must also be included in the add-in folder.
The name of the add-in (as displayed in the Expression Web Manage Add-ins dialog box) is determined by the <name> property in the addin.xml manifest file, not by the name of the folder.
For more information, see The add-in manifest.
To create an extension package
Create a .zip file of the folder that contains your add-in. For example, if your add-in folder is named myAddin, in Windows Explorer, right-click on the myAddin folder, click Send to, and then click Compressed (zipped) folder. Windows creates the .zip file, naming it "myAddin.zip."
Rename the file to change the file name extension to .xadd. The example file should now be named "myAddin.xadd."
To install an extension package
In Expression Web, click Tools, and then click Add-Ins. The Manage Add-ins dialog box is displayed.
Click Install, browse to the location of the add-in you want to install, and then click Open. The extension is unpacked and added to the list of add-ins.
When you install an add-in, it is immediately available in Expression Web.
Expression Web add-ins must be installed using the Expression Web Manage Add-ins dialog box.