Change the error message when attempting to open a file that cannot be opened.

Previously, a file that could not be opened had to be a failed download.
Now that we allow the download of files which cannot be opened, we need
a different error message when attempting to open them.
diff --git a/res/values/strings.xml b/res/values/strings.xml
index d81e38d..1999f54 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -603,7 +603,10 @@
             external storage is busy so they cannot download anything.  Informs
             the user how to enable SD card storage -->
     <string name="download_sdcard_busy_dlg_msg">The SD card is busy. To allow downloads, select \"Turn off USB storage\" in the notification.</string>
- 
+
+    <!-- Title for a dialog informing the user that there is no application on
+            the phone that can open the file that was downloaded -->
+    <string name="download_no_application_title">Cannot open file</string>
     <!-- Message for a dialog informing the user that there is no application on
             the phone that can open the file that was downloaded  -->
     <string name="download_no_application">No application can be found to open this file.</string>