diff --git a/core/core.js b/core/core.js
index f3151961..074989fb 100644
--- a/core/core.js
+++ b/core/core.js
@@ -29,6 +29,7 @@ const k_magic_bytes = [
 	{bytes: [null, null, null, null, 0x66, 0x74, 0x79, 0x70, 0x6d, 0x70, 0x34, 0x32], type: 'audio/mpeg'},
 	{bytes: [null, null, null, null, 0x66, 0x74, 0x79, 0x70, 0x69, 0x73, 0x6f, 0x6d], type: 'video/mp4'},
 	{bytes: [null, null, null, null, 0x66, 0x74, 0x79, 0x70, 0x6d, 0x70, 0x34, 0x32], type: 'video/mp4'},
+	{bytes: [0x4d, 0x54, 0x68, 0x64], type: 'audio/midi'},
 ];
 
 let k_static_files = [