Index: apps/screens.c
===================================================================
--- apps/screens.c  (revision 28876)
+++ apps/screens.c  (working copy)
@@ -629,6 +629,7 @@
     LANG_ID3_TRACK_GAIN,
     LANG_ID3_ALBUM_GAIN,
 #endif
+    LANG_ID3_FILESIZE,
     LANG_ID3_PATH,
 };

@@ -739,6 +740,10 @@
             case LANG_ID3_COMPOSER:
                 val=id3->composer;
                 break;
+            case LANG_ID3_FILESIZE:
+                snprintf(buffer, buffer_len, "%ld KB", id3->filesize / 1024);
+                val=buffer;
+                break;
         }
         return val && *val ? val : NULL;
     }
Index: apps/lang/english.lang
===================================================================
--- apps/lang/english.lang  (revision 28876)
+++ apps/lang/english.lang  (working copy)
@@ -12674,3 +12674,17 @@
     radio: "Signal strength:"
   </voice>
 </phrase>
+<phrase>
+  id: LANG_ID3_FILESIZE
+  desc: in tag viewer
+  user: core
+  <source>
+    *: "File Size"
+  </source>
+  <dest>
+    *: "File Size"
+  </dest>
+  <voice>
+    *: ""
+  </voice>
+</phrase>