diff --git a/src/formats.c b/src/formats.c
index 511d5587..eac58b18 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -143,6 +143,7 @@ static const char* extension_list[] = {
     "cwav",
     "cxs",
 
+    "d2", //txth/reserved [Dodonpachi Dai-Ou-Jou (PS2)]
     "da",
     //"dat", //common
     "data",