Index: riff.c
===================================================================
--- riff.c	(revision 968)
+++ riff.c	(working copy)
@@ -175,6 +175,13 @@
                                     goto fail;
                             }
                             break;
+                        case 2: /* MS ADPCM */
+                            /* ensure 4bps */
+                            if (read_16bitLE(current_chunk+0x16,streamFile)!=4)
+                                goto fail;
+                            coding_type = coding_MSADPCM;
+                            interleave = 0;
+                            break;
                         case 0x11:  /* MS IMA ADCM */
                             /* ensure 4bps */
                             if (read_16bitLE(current_chunk+0x16,streamFile)!=4)
@@ -279,6 +286,7 @@
         case coding_L5_555:
             sample_count = data_size/0x12/channel_count*32;
             break;
+        case coding_MSADPCM:
         case coding_MS_IMA:
             sample_count = (data_size / block_size) * (block_size - 4 * channel_count) * 2 / channel_count +
                 ((data_size % block_size) ? (data_size % block_size - 4 * channel_count) * 2 / channel_count : 0);
@@ -302,13 +310,13 @@
     vgmstream->sample_rate = sample_rate;
 
     vgmstream->coding_type = coding_type;
-    if (channel_count > 1 && coding_type != coding_PCM8_U_int && coding_type != coding_MS_IMA)
+    if (channel_count > 1 && coding_type != coding_PCM8_U_int && coding_type != coding_MS_IMA && coding_type != coding_MSADPCM)
         vgmstream->layout_type = layout_interleave;
     else
         vgmstream->layout_type = layout_none;
     vgmstream->interleave_block_size = interleave;
 
-    if (coding_type == coding_MS_IMA)
+    if (coding_type == coding_MS_IMA || coding_type == coding_MSADPCM)
         vgmstream->interleave_block_size = block_size;
 
     if (loop_flag) {