Provide a save file type for unknown extensions

app/resources/app_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. Specifically, these are UI strings that are used by app/ that
 need to be translated for each locale.-->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <!-- TODO add each of your output files.  Modify the three below, and add
@@ skipping 169 matching lines @@
         (empty)
       </message>
 
       <!-- General application strings -->
       <message name="IDS_APP_UNTITLED_SHORTCUT_FILE_NAME" desc="The name of the Internet Shortcut file created for URLs dragged that have no title">
         Untitled Web Page
       </message>
       <message name="IDS_APP_SAVEAS_ALL_FILES" desc="Save As dialog box default text">
         All Files
       </message>
+      <message name="IDS_APP_SAVEAS_EXTENSION_FORMAT" desc="Save As dialog box extension format text">
+        <ph name="SAVEAS_EXTENSION_TYPE">$1<ex>EXE</ex></ph> File (.<ph name="SAVEAS_EXTENSION_NAME">$2<ex>exe</ex></ph>)
+      </message>
 
       <!--Accessible name/action strings-->
       <message name="IDS_APP_ACCACTION_PRESS" desc="The accessible default action for a button.">
         Press
       </message>
 
       <!-- Scroll Bar Context Menu Labels -->
       <message name="IDS_APP_SCROLLBAR_CXMENU_SCROLLHERE" desc="The label for the 'Scroll Here' item">
         Scroll to Here
       </message>
@@ skipping 113 matching lines @@
       <message name="IDS_APP_ALT_MODIFIER" desc="Alt key shortcut modifier">
         Alt+<ph name="KEY_COMBO_NAME">$1<ex>C</ex></ph>
       </message>
       <message name="IDS_APP_SHIFT_MODIFIER" desc="Shift key shortcut modifier">
         Shift+<ph name="KEY_COMBO_NAME">$1<ex>C</ex></ph>
       </message>
       
     </messages>
   </release>
 </grit>