diff --git a/Filters.cs b/Filters.cs
index 38c7d2a0a..3cff3ceb3 100644
--- a/Filters.cs
+++ b/Filters.cs
@@ -42,6 +42,7 @@ using System.IO;
 using System.Linq;
 using System.Reflection;
 using Aaru.CommonTypes.Interfaces;
+using Aaru.CommonTypes.Structs;
 using Aaru.Console;
 
 namespace Aaru.CommonTypes
@@ -93,9 +94,7 @@ namespace Aaru.CommonTypes
                         var foundFilter = (IFilter)filter.GetType().GetConstructor(Type.EmptyTypes)?.Invoke(new object[]
                             {});
 
-                        foundFilter?.Open(path);
-
-                        if(foundFilter.Opened)
+                        if(foundFilter?.Open(path) == Errno.NoError)
                             return foundFilter;
                     }
                     else
diff --git a/Interfaces/IFilter.cs b/Interfaces/IFilter.cs
index cb5bd6c87..eb6d86305 100644
--- a/Interfaces/IFilter.cs
+++ b/Interfaces/IFilter.cs
@@ -38,6 +38,7 @@
 
 using System;
 using System.IO;
+using Aaru.CommonTypes.Structs;
 
 namespace Aaru.CommonTypes.Interfaces
 {
@@ -108,12 +109,6 @@ namespace Aaru.CommonTypes.Interfaces
         /// <summary>Returns true if the file referenced by this filter has a resource fork</summary>
         bool HasResourceFork { get; }
 
-        /// <summary>
-        ///     Returns true if the filter has a file/stream/buffer currently opened and no
-        ///     <see cref="M:Aaru.Filters.Filter.Close" /> has been issued.
-        /// </summary>
-        bool Opened { get; }
-
         /// <summary>Closes all opened streams.</summary>
         void Close();
 
@@ -139,14 +134,14 @@ namespace Aaru.CommonTypes.Interfaces
 
         /// <summary>Opens the specified path with this filter instance</summary>
         /// <param name="path">Path.</param>
-        void Open(string path);
+        Errno Open(string path);
 
         /// <summary>Opens the specified stream with this filter instance</summary>
         /// <param name="stream">Stream.</param>
-        void Open(Stream stream);
+        Errno Open(Stream stream);
 
         /// <summary>Opens the specified buffer with this filter instance</summary>
         /// <param name="buffer">Buffer.</param>
-        void Open(byte[] buffer);
+        Errno Open(byte[] buffer);
     }
 }
\ No newline at end of file