[kupfer] help: Add information on changing file associations

[Ulrik Sverdrup <usverdrup src gnome org>]

commit c327c3190ad2b719c12c6d4caf063905c7be8165
Author: Ulrik Sverdrup <ulrik sverdrup gmail com>
Date:   Tue Mar 29 21:28:55 2011 +0200

    help: Add information on changing file associations

 help/C/moreusage.page           |    9 +++++++++
 help/C/plugin-applications.page |   33 ++++++++++++++++++++++++++++++++-
 2 files changed, 41 insertions(+), 1 deletions(-)
---
diff --git a/help/C/moreusage.page b/help/C/moreusage.page
index 22e4795..d7a549d 100644
--- a/help/C/moreusage.page
+++ b/help/C/moreusage.page
@@ -34,6 +34,15 @@
   </p>
  </section>
 
+  <section>
+    <title>Opening Files and Folders</title>
+    <p>
+      Using the action <em>Open</em>, files and folders are opened in their
+      preferred application. The application associations can be changed,
+      see <link xref="plugin-applications"/>.
+    </p>
+  </section>
+
  <section>
    <title>The <em>Comma Trick</em></title>
     <p> The comma trick allows the user to use actions on many objects at
diff --git a/help/C/plugin-applications.page b/help/C/plugin-applications.page
index f0e4475..ad9ed92 100644
--- a/help/C/plugin-applications.page
+++ b/help/C/plugin-applications.page
@@ -45,7 +45,38 @@
      <item>
       <p>
         Type <key>Tab</key> to select the third (indirect object) pane
-        and in it, select the application the file with.
+        and in it, select the application to open the file with.
+      </p>
+     </item>
+   </steps>
+
+   <p>
+     The action <em>Open</em> opens files and folders with the registered
+     default application for that specific file type. This can be
+     configured using the action <em>Set Default Application...</em>.
+   </p>
+   <p>
+     The file type associations are provided by the desktop environment, and
+     modifying them here will modify them on the desktop as well. This may
+     not be true when not using GNOME or XFCE.
+   </p>
+   <steps>
+     <title>Selecting default application for a file type or folders</title>
+     <item>
+      <p>
+        Select a file or folder in <app>Kupfer</app>
+      </p>
+     </item>
+     <item>
+      <p>
+        Type <key>Tab</key> and select the action <em>Set Default
+          Application...</em>
+      </p>
+     </item>
+     <item>
+      <p>
+        Type <key>Tab</key> to select the third (indirect object) pane
+        and in it, select the application to always open the file type with.
       </p>
      </item>
    </steps>