Silverlight: Server Requirements


Hosting Silverlight applications on a web server does not normally require any special configuration. The only real server requirement is to associate the .xap file extension with the MIME type application/x-silverlight and the ability to serve standard file types such as .html, .js, .xaml, .zip, .dll, and any media files that are required.

Silverlight MIME Types

The server is required to send the correct MIME type for Silverlight applications to run properly. Otherwise you may experience a case where only an empty white canvas is displayed. Below is a list of the file extensions used by Silverlight and their corresponding mime types.

Required MIME types

Extension MIME type
.xaml application/xaml+xml
.xap application/x-silverlight

Server Configuration

The following lists helpful tips on configuring some of the most popular servers.

Server Action required
IIS6 Add MIME types under web site properties, HTTP-Header, MIME Types.
IIS7 No action required.
Apache Use mod_rewrite, or mod_mime with the AddType directive in http.conf and restart Apache. You may also modify the .htaccess file at the directory level.
Lighttpd Add MIME types using mimetype.assign.
Sun Java System Web Server Add MIME types to the config directory MIME types file.
Tomcat Add MIME types to the %TOMCAT_INSTALL/conf/web.xml file and restart Tomcat.
Amazon S3 Make sure you set the correct MIME type when you upload the file.


If you are using a hosting plan or working in an environment where you are not able to get the MIME types configured, you can rename your .xap files to use the .zip extension. You will also need to update any references in your embed code to point to the new filename.

Further Reading

Related information on the web is listed below.