Bug #38374 --> more updates for external helper application support.

(NOT PART OF THE BUILD) r=mscott

profile/defaults/helperApps.rdf

@@ -0,0 +1,49 @@
+<?xml version="1.0"?>  
+
+<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:NC="http://home.netscape.com/NC-rdf#">
+
+  <Description about="urn:mimetypes"> 
+    <NC:MIME-types> 
+	    <Seq> 
+		    <li resource="urn:mimetype:application/pdf"/> 
+		    <li resource="urn:mimetype:text/html"/> 
+	    </Seq> 
+    </NC:MIME-types> 
+  </Description> 
+
+  <Description about="urn:mimetype:application/pdf"> 
+    <NC:value>application/pdf</NC:value> 
+    <NC:description>Portable Document Format</NC:description> 
+    <NC:editable>true</NC:editable> 
+    <NC:fileExtensions> 
+      <NC:fileExtension>pdf</NC:fileExtension> 
+      <NC:fileExtension>foo</NC:fileExtension> 
+    </NC:fileExtensions> 
+    <NC:handler> 
+      <NC:saveToDisk>true</NC:saveToDisk> 
+      <NC:handleInternal>false</NC:handleInternal> 
+      <NC:externalApplication> 
+        <NC:prettyName>Adobe Acrobat</NC:prettyName> 
+        <NC:path>C:\Program Files\Adobe\acrobat.exe</NC:path> 
+      </NC:externalApplication> 
+    </NC:handler>     
+  </Description> 
+  
+  <Description about="urn:mimetype:text/html"> 
+    <NC:value>text/html</NC:value> 
+    <NC:description>Hypertext Document</NC:description> 
+    <NC:editable>false</NC:editable> 
+    <NC:fileExtensions> 
+      <NC:fileExtension>htm</NC:fileExtension>
+      <NC:fileExtension>html</NC:fileExtension> 
+    </NC:fileExtensions> 
+    <NC:handler> 
+      <NC:saveToDisk>false</NC:saveToDisk> 
+      <NC:handleInternal>true</NC:handleInternal> 
+      <NC:externalApplication> 
+        <NC:prettyName></NC:prettyName> 
+        <NC:path></NC:path> 
+      </NC:externalApplication> 
+    </NC:handler> 
+  </Description> 
+</RDF>