--- OniSplit/Sound/AifExporter.cs	2020/01/22 14:08:57	1114
+++ OniSplit/Sound/AifExporter.cs	2020/05/28 21:28:44	1130
@@ -31,6 +31,10 @@ namespace Oni.Sound
             using (var stream = File.Create(Path.Combine(OutputDirPath, descriptor.FullName + ".aif")))
             using (var writer = new BinaryWriter(stream))
             {
+                if (!(sound.IsIMA4))
+                {
+                    throw new NotSupportedException("Transcoding from PC ADPCM to Mac/demo ADPCM not supported!");
+                }
                 writer.Write(Utils.ByteSwap(fcc_FORM));
                 writer.Write(Utils.ByteSwap(50 + sound.Data.Length));
                 writer.Write(Utils.ByteSwap(fcc_AIFC));