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diff --git a/compat/zlib/win32/README.txt b/compat/zlib/win32/README.txt
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+
+What's here
+===========
+  The official ZLIB1.DLL
+
+
+Source
+======
+  zlib version 1.2.5
+  available at http://www.gzip.org/zlib/
+
+
+Specification and rationale
+===========================
+  See the accompanying DLL_FAQ.txt
+
+
+Usage
+=====
+  See the accompanying USAGE.txt
+
+
+Build info
+==========
+  Contributed by Cosmin Truta.
+
+  Compiler:
+    gcc-4.5.0-1-mingw32
+  Library:
+    mingwrt-3.17, w32api-3.14
+  Build commands:
+    gcc -c -DASMV contrib/asm686/match.S
+    gcc -c -DASMINF -I. -O3 contrib/inflate86/inffas86.c
+    make -f win32/Makefile.gcc LOC="-DASMV -DASMINF" OBJA="inffas86.o match.o"
+
+
+Copyright notice
+================
+  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu
+
diff --git a/compat/zlib/win32/USAGE.txt b/compat/zlib/win32/USAGE.txt
new file mode 100644
index 0000000..48e594e
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+++ b/compat/zlib/win32/USAGE.txt
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+
+Installing ZLIB1.DLL
+====================
+  Copy ZLIB1.DLL to the SYSTEM or the SYSTEM32 directory.
+
+
+Using ZLIB1.DLL with Microsoft Visual C++
+=========================================
+   1. Install the supplied header files "zlib.h" and "zconf.h"
+      into a directory found in the INCLUDE path list.
+
+   2. Install the supplied library file "zdll.lib" into a
+      directory found in the LIB path list.
+
+   3. Add "zdll.lib" to your project.
+
+
+Using ZLIB1.DLL with gcc/MinGW
+==============================
+   1. Install the supplied header files "zlib.h" and "zconf.h"
+      into the INCLUDE directory.
+
+   2. Copy the supplied library file "zdll.lib" to "libzdll.a":
+        cp lib/zdll.lib lib/libzdll.a
+
+      OR
+
+   2' Build the import library from the supplied "zlib.def":
+        dlltool -D zlib1.dll -d lib/zlib.def -l lib/libzdll.a
+
+   3. Install "libzdll.a" into the LIB directory.
+
+   4. Add "libzdll.a" to your project, or use the -lzdll option.
+
+
+Using ZLIB1.DLL with gcc/Cygwin
+===============================
+  ZLIB1.DLL is not designed to work with Cygwin.  The Cygwin
+  system has its own DLL build of zlib, named CYGZ.DLL.
+
+
+Using ZLIB1.DLL with Borland C++
+================================
+   1. Install the supplied header files "zlib.h" and "zconf.h"
+      into a directory found in the INCLUDE path list.
+
+   2. Build the import library using the IMPLIB tool:
+        implib -a -c -f lib\zdllbor.lib zlib1.dll
+
+      OR
+
+   2' Convert the supplied library file "zdll.lib" to OMF format,
+      using the COFF2OMF tool:
+        coff2omf lib\zdll.lib lib\zdllbor.lib
+
+   3. Install "zdllbor.lib" into a directory found in the LIB path
+      list.
+
+   4. Add "zdllbor.lib" to your project.
+
+  Notes:
+  - The modules that are linked with "zdllbor.lib" must be compiled
+    using a 4-byte alignment (option -a):
+        bcc32 -a -c myprog.c
+        bcc32 myprog.obj zdllbor.lib
+  - If you wish, you may use "zlib1.lib" instead of "zdllbor.lib".
+
+
+Rebuilding ZLIB1.DLL
+====================
+  Depending on your build environment, use the appropriate
+  makefile from the win32/ directory, found in the zlib source
+  distribution.
+
+  Your custom build has to comply with the requirements stated
+  in DLL_FAQ.txt, including (but not limited to) the following:
+    - It must be built from an unaltered zlib source distribution.
+    - It must be linked to MSVCRT.DLL.
+    - The macros that compile out certain portions of the zlib
+      code (such as NO_GZCOMPRESS, NO_GZIP) must not be enabled.
+    - The ZLIB_WINAPI macro must not be enabled.
+
+  Furthermore, it has to run successfully with the test suite
+  found in this package.
+
+  It is recommended, however, to use the supplied ZLIB1.DLL,
+  instead of rebuilding it yourself.  You should rebuild it
+  only if you have a special reason.
+
diff --git a/compat/zlib/win32/zlib1.dll b/compat/zlib/win32/zlib1.dll
index bfc3ba9..869b00d 100644
--- a/compat/zlib/win32/zlib1.dll
+++ b/compat/zlib/win32/zlib1.dll