Microsoft Portable Executable and Common Object File Format Specification - 12
Revision 8.1 – February 15, 2008
© 2005–2008 Microsoft Corporation. All rights reserved.
3.4.2. Optional Header Windows-Specific Fields (Image Only)
The next 21 fields are an extension to the COFF optional header format. They
contain additional information that is required by the linker and loader in
Windows.
Offset
(PE32/
PE32+)
Size
(PE32/
PE32+)
Field Description
28/24 4/8 ImageBase The preferred address of the first byte
of image when loaded into memory;
must be a multiple of 64 K. The
default for DLLs is 0x10000000. The
default for Windows CE EXEs is
0x00010000. The default for
Windows NT, Windows 2000,
Windows XP, Windows 95,
Windows 98, and Windows Me is
0x00400000.
32/32 4 SectionAlignment The alignment (in bytes) of sections
when they are loaded into memory. It
must be greater than or equal to
FileAlignment. The default is the page
size for the architecture.
36/36 4 FileAlignment The alignment factor (in bytes) that is
used to align the raw data of sections
in the image file. The value should be
a power of 2 between 512 and 64 K,
inclusive. The default is 512. If the
SectionAlignment is less than the
architecture’s page size, then
FileAlignment must match
SectionAlignment.
40/40 2 MajorOperatingSystemVersion The major version number of the
required operating system.
42/42 2 MinorOperatingSystemVersion The minor version number of the
required operating system.
44/44 2 MajorImageVersion The major version number of the
image.
46/46 2 MinorImageVersion The minor version number of the
image.
48/48 2 MajorSubsystemVersion The major version number of the
subsystem.
50/50 2 MinorSubsystemVersion The minor version number of the
subsystem.
52/52 4 Win32VersionValue Reserved, must be zero.
56/56 4 SizeOfImage The size (in bytes) of the image,
including all headers, as the image is
loaded in memory. It must be a
multiple of SectionAlignment.
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