diff --git a/Aaru.Archives/Amg/Files.cs b/Aaru.Archives/Amg/Files.cs
index 85702a968..682e3136e 100644
--- a/Aaru.Archives/Amg/Files.cs
+++ b/Aaru.Archives/Amg/Files.cs
@@ -46,5 +46,33 @@ public sealed partial class Amg
         return ErrorNumber.NoSuchFile;
     }
 
+    /// <inheritdoc />
+    public ErrorNumber GetCompressedSize(int entryNumber, out long length)
+    {
+        length = -1;
+
+        if(!Opened) return ErrorNumber.NotOpened;
+
+        if(entryNumber < 0 || entryNumber >= _files.Count) return ErrorNumber.OutOfRange;
+
+        length = _files[entryNumber].Compressed;
+
+        return ErrorNumber.NoError;
+    }
+
+    /// <inheritdoc />
+    public ErrorNumber GetUncompressedSize(int entryNumber, out long length)
+    {
+        length = -1;
+
+        if(!Opened) return ErrorNumber.NotOpened;
+
+        if(entryNumber < 0 || entryNumber >= _files.Count) return ErrorNumber.OutOfRange;
+
+        length = _files[entryNumber].Uncompressed;
+
+        return ErrorNumber.NoError;
+    }
+
 #endregion
 }
\ No newline at end of file
diff --git a/Aaru.Archives/Amg/Unimplemented.cs b/Aaru.Archives/Amg/Unimplemented.cs
index 26fab6cc0..ebfdbd76c 100644
--- a/Aaru.Archives/Amg/Unimplemented.cs
+++ b/Aaru.Archives/Amg/Unimplemented.cs
@@ -11,12 +11,6 @@ public sealed partial class Amg
 {
 #region IArchive Members
 
-    /// <inheritdoc />
-    public ErrorNumber GetCompressedSize(int entryNumber, out long length) => throw new NotImplementedException();
-
-    /// <inheritdoc />
-    public ErrorNumber GetUncompressedSize(int entryNumber, out long length) => throw new NotImplementedException();
-
     /// <inheritdoc />
     public ErrorNumber GetAttributes(int entryNumber, out FileAttributes attributes) =>
         throw new NotImplementedException();