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diff --git a/MdePkg/Include/Guid/AprioriFileName.h b/MdePkg/Include/Guid/AprioriFileName.h
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+++ b/MdePkg/Include/Guid/AprioriFileName.h
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+/** @file
+
+  The GUID PEI_APRIORI_FILE_NAME_GUID definition is the file
+  name of the PEI a priori file that is stored in a firmware
+  volume.
+
+  Copyright (c) 2006 - 2007, Intel Corporation                                                         
+  All rights reserved. This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+  Module Name:  AprioriFileName.h
+
+  @par Revision Reference: PI
+  Version 1.00.
+
+**/
+
+#ifndef __PEI_APRIORI_FILE_NAME_H__
+#define __PEI_APRIORI_FILE_NAME_H__
+
+#define PEI_APRIORI_FILE_NAME_GUID \
+  { 0x1b45cc0a, 0x156a, 0x428a, { 0x62, 0XAF, 0x49, 0x86, 0x4d, 0xa0, 0xe6, 0xe6 } }
+
+
+/**
+   
+  This file must be of type EFI_FV_FILETYPE_FREEFORM and must
+  contain a single section of type EFI_SECTION_RAW. For details on
+  firmware volumes, firmware file types, and firmware file section
+  types.
+
+  @param FileNamesWithinVolume[]  An array of zero or more
+                                  EFI_GUID type entries that
+                                  match the file names of PEIM
+                                  modules in the same Firmware
+                                  Volume. The maximum number of
+                                  entries.
+
+  @param NumberOfModulesInVolume  Determined by the number of
+                                  modules in the FV.
+  
+**/
+typedef struct {
+  EFI_GUID  FileNamesWithinVolume[1];
+// Optional list of file-names
+} PEI_APRIORI_FILE_CONTENTS;
+
+extern EFI_GUID gPeiAprioriFileNameGuid;
+
+#endif
+