<p>Can I setup a custom MIME type through ASP.NET or some .NET code?  I need to register the Silverlight XAML and XAP MIME types in IIS 6.</p>

To add to the master mime type list:
```
```
using (DirectoryEntry mimeMap = new DirectoryEntry("IIS://Localhost/MimeMap"))
{
    PropertyValueCollection propValues = mimeMap.Properties["MimeMap"];

    IISOle.MimeMapClass newMimeType = new IISOle.MimeMapClass();
    newMimeType.Extension = extension; // string - .xap
    newMimeType.MimeType = mimeType;   // string - application/x-silverlight-app

    propValues.Add(newMimeType);
    mimeMap.CommitChanges();
}
```
```
Add a reference to :
'System.DirectoryServices' on the .NET add references tab
'Active DS IIS Namespace Provider' on the COM add references tab.
To configure a mime type for a specific site, change ..
```
'IIS://Localhost/MimeMap'
```
to
```
'IIS://Localhost/W3SVC/[iisnumber]/root'
```
...replacing
```
'[iisnumber]'
```
with the IISNumber of the website.