I need to add additional document types to the Default.config file at runtime, either by Javascript or in VB codebehind when the page loads.

 

Currently, Default.config has:

 

 <security name="TemplateFilters">
  <item>.txt</item>
  <item>.rtf</item>
  <item>.html</item>
  <item>.htm</item>
  <item>.xml</item>
 </security>

 

I need to add a special type.

 

How to do that?