diff --git a/ArcFormats/Entis/ImageERI.cs b/ArcFormats/Entis/ImageERI.cs
index 38e39a9f..1688c3bd 100644
--- a/ArcFormats/Entis/ImageERI.cs
+++ b/ArcFormats/Entis/ImageERI.cs
@@ -300,7 +300,7 @@ namespace GameRes.Formats.Entis
                         {
                             var ref_info = ReadMetaData (ref_src) as EriMetaData;
                             if (null == ref_info)
-                                throw new FileNotFoundException ("Referenced image not found");
+                                throw new FileNotFoundException ("Referenced image not found", ref_file);
                             ref_info.FileName = ref_file;
                             var ref_reader = ReadImageData (ref_src, ref_info);
                             AddImageBuffer (meta, reader.Data, ref_info, ref_reader.Data);
diff --git a/ArcFormats/KiriKiri/ImageTLG.cs b/ArcFormats/KiriKiri/ImageTLG.cs
index 4bcc343f..f1b3e913 100644
--- a/ArcFormats/KiriKiri/ImageTLG.cs
+++ b/ArcFormats/KiriKiri/ImageTLG.cs
@@ -109,6 +109,10 @@ namespace GameRes.Formats.KiriKiri
                     if (null != blended_image)
                         return blended_image;
                 }
+                catch (FileNotFoundException X)
+                {
+                    Trace.WriteLine (string.Format ("{0}: {1}", X.Message, X.FileName), "[TlgFormat.Read]");
+                }
                 catch (Exception X)
                 {
                     Trace.WriteLine (X.Message, "[TlgFormat.Read]");
diff --git a/GameRes/FileSystem.cs b/GameRes/FileSystem.cs
index 4427518d..96ad69a5 100644
--- a/GameRes/FileSystem.cs
+++ b/GameRes/FileSystem.cs
@@ -303,7 +303,7 @@ namespace GameRes
         {
             Entry entry = null;
             if (!m_dir.TryGetValue (filename, out entry))
-                throw new FileNotFoundException();
+                throw new FileNotFoundException ("Unable to find the specified file.", filename);
             return entry;
         }
 
@@ -373,7 +373,7 @@ namespace GameRes
             var dir_name = filename + PathDelimiter;
             if (m_dir.Keys.Any (n => n.StartsWith (dir_name)))
                 return new SubDirEntry (filename);
-            throw new FileNotFoundException();
+            throw new FileNotFoundException ("Unable to find the specified file.", filename);
         }
 
         static readonly Regex path_re = new Regex (@"\G[/\\]?([^/\\]+)([/\\])");
@@ -678,7 +678,7 @@ namespace GameRes
                 {
                     var entry = m_vfs.Top.FindFile (desired[Count-1]);
                     if (entry is SubDirEntry)
-                        throw new FileNotFoundException();
+                        throw new FileNotFoundException ("Unable to find the specified file.", desired[Count-1]);
                     m_vfs.ChDir (entry);
                 }
                 m_vfs.Top.CurrentDirectory = desired.Last();