diff --git a/src/xenia/kernel/xboxkrnl_io.cc b/src/xenia/kernel/xboxkrnl_io.cc
index 56794a523..7f91478c3 100644
--- a/src/xenia/kernel/xboxkrnl_io.cc
+++ b/src/xenia/kernel/xboxkrnl_io.cc
@@ -328,6 +328,17 @@ SHIM_CALL NtQueryInformationFile_shim(
         file_info.Write(SHIM_MEM_BASE, file_info_ptr);
       }
       break;
+    case XFileMailslotSetInformation:
+      // Read timeout.
+      if (length == 4) {
+        info = 4; // ? it's not a read.
+        uint32_t read_timeout = SHIM_MEM_32(file_info_ptr);
+        // May be INFINITE.
+        // Do something with this?
+      } else {
+        result = X_STATUS_INFO_LENGTH_MISMATCH;
+      }
+      break;
     default:
       // Unsupported, for now.
       XEASSERTALWAYS();
diff --git a/src/xenia/kernel/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl_threading.cc
index fbc933e82..ed04f79ee 100644
--- a/src/xenia/kernel/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl_threading.cc
@@ -928,7 +928,7 @@ SHIM_CALL NtReleaseMutant_shim(
   bool wait = false;
 
   XELOGD(
-      "NtReleaseMutant(%.8X, %8.X)",
+      "NtReleaseMutant(%.8X, %.8X)",
       mutant_handle, unknown);
 
   X_STATUS result = X_STATUS_SUCCESS;
diff --git a/src/xenia/xbox.h b/src/xenia/xbox.h
index 2f164adb7..fa622ebb8 100644
--- a/src/xenia/xbox.h
+++ b/src/xenia/xbox.h
@@ -27,29 +27,30 @@ typedef uint32_t X_HANDLE;
 typedef uint32_t X_STATUS;
 #define XSUCCEEDED(s)     ((s & 0xC0000000) == 0)
 #define XFAILED(s)        (!XSUCCEEDED(s))
-#define X_STATUS_SUCCESS                                ((uint32_t)0x00000000L)
-#define X_STATUS_ABANDONED_WAIT_0                       ((uint32_t)0x00000080L)
-#define X_STATUS_USER_APC                               ((uint32_t)0x000000C0L)
-#define X_STATUS_ALERTED                                ((uint32_t)0x00000101L)
-#define X_STATUS_TIMEOUT                                ((uint32_t)0x00000102L)
-#define X_STATUS_PENDING                                ((uint32_t)0x00000103L)
-#define X_STATUS_UNSUCCESSFUL                           ((uint32_t)0xC0000001L)
-#define X_STATUS_NOT_IMPLEMENTED                        ((uint32_t)0xC0000002L)
-#define X_STATUS_ACCESS_VIOLATION                       ((uint32_t)0xC0000005L)
-#define X_STATUS_INVALID_HANDLE                         ((uint32_t)0xC0000008L)
-#define X_STATUS_INVALID_PARAMETER                      ((uint32_t)0xC000000DL)
-#define X_STATUS_NO_SUCH_FILE                           ((uint32_t)0xC000000FL)
-#define X_STATUS_NO_MEMORY                              ((uint32_t)0xC0000017L)
-#define X_STATUS_ALREADY_COMMITTED                      ((uint32_t)0xC0000021L)
-#define X_STATUS_ACCESS_DENIED                          ((uint32_t)0xC0000022L)
-#define X_STATUS_BUFFER_TOO_SMALL                       ((uint32_t)0xC0000023L)
-#define X_STATUS_OBJECT_TYPE_MISMATCH                   ((uint32_t)0xC0000024L)
-#define X_STATUS_INVALID_PAGE_PROTECTION                ((uint32_t)0xC0000045L)
-#define X_STATUS_MUTANT_NOT_OWNED                       ((uint32_t)0xC0000046L)
-#define X_STATUS_MEMORY_NOT_ALLOCATED                   ((uint32_t)0xC00000A0L)
-#define X_STATUS_INVALID_PARAMETER_1                    ((uint32_t)0xC00000EFL)
-#define X_STATUS_INVALID_PARAMETER_2                    ((uint32_t)0xC00000F0L)
-#define X_STATUS_INVALID_PARAMETER_3                    ((uint32_t)0xC00000F1L)
+#define X_STATUS_SUCCESS                                ((X_STATUS)0x00000000L)
+#define X_STATUS_ABANDONED_WAIT_0                       ((X_STATUS)0x00000080L)
+#define X_STATUS_USER_APC                               ((X_STATUS)0x000000C0L)
+#define X_STATUS_ALERTED                                ((X_STATUS)0x00000101L)
+#define X_STATUS_TIMEOUT                                ((X_STATUS)0x00000102L)
+#define X_STATUS_PENDING                                ((X_STATUS)0x00000103L)
+#define X_STATUS_UNSUCCESSFUL                           ((X_STATUS)0xC0000001L)
+#define X_STATUS_NOT_IMPLEMENTED                        ((X_STATUS)0xC0000002L)
+#define X_STATUS_INFO_LENGTH_MISMATCH                   ((X_STATUS)0xC0000004L)
+#define X_STATUS_ACCESS_VIOLATION                       ((X_STATUS)0xC0000005L)
+#define X_STATUS_INVALID_HANDLE                         ((X_STATUS)0xC0000008L)
+#define X_STATUS_INVALID_PARAMETER                      ((X_STATUS)0xC000000DL)
+#define X_STATUS_NO_SUCH_FILE                           ((X_STATUS)0xC000000FL)
+#define X_STATUS_NO_MEMORY                              ((X_STATUS)0xC0000017L)
+#define X_STATUS_ALREADY_COMMITTED                      ((X_STATUS)0xC0000021L)
+#define X_STATUS_ACCESS_DENIED                          ((X_STATUS)0xC0000022L)
+#define X_STATUS_BUFFER_TOO_SMALL                       ((X_STATUS)0xC0000023L)
+#define X_STATUS_OBJECT_TYPE_MISMATCH                   ((X_STATUS)0xC0000024L)
+#define X_STATUS_INVALID_PAGE_PROTECTION                ((X_STATUS)0xC0000045L)
+#define X_STATUS_MUTANT_NOT_OWNED                       ((X_STATUS)0xC0000046L)
+#define X_STATUS_MEMORY_NOT_ALLOCATED                   ((X_STATUS)0xC00000A0L)
+#define X_STATUS_INVALID_PARAMETER_1                    ((X_STATUS)0xC00000EFL)
+#define X_STATUS_INVALID_PARAMETER_2                    ((X_STATUS)0xC00000F0L)
+#define X_STATUS_INVALID_PARAMETER_3                    ((X_STATUS)0xC00000F1L)
 
 // HRESULT (ERROR_*)
 // Adding as needed.