diff --git a/HowtoBuildPyCryptoOnWindows.md b/HowtoBuildPyCryptoOnWindows.md
new file mode 100644
index 0000000..8139a29
--- /dev/null
+++ b/HowtoBuildPyCryptoOnWindows.md
@@ -0,0 +1,55 @@
+# How to build eggs for PyCrypto on Win32
+
+## Preparation
+Download and install 7-zip (to extract .tar.gz)
+ 
+<http://downloads.sourceforge.net/sevenzip/7z920.exe>
+
+Download hashdeep, extract to PATH (to check SHA-256 checksums)
+<http://sourceforge.net/projects/md5deep/files/md5deep/md5deep-3.9.2/md5deep-3.9.2.zip/download>
+
+Download Mingw32 installer and run it.
+<http://sourceforge.net/projects/mingw/files/Automated%20MinGW%20Installer/mingw-get-inst/mingw-get-inst-20110802/mingw-get-inst-20110802.exe/download>
+
+Download pycrypto: 
+<http://ftp.dlitz.net/pub/dlitz/crypto/pycrypto/pycrypto-2.4.tar.gz>
+
+Check the SHA-256 hash: 
+`C:\> hashdeep -c sha256 pycrypto-2.4.tar.gz`
+
+Extract pycrypto-2.4.tar.gz with 7-zip.
+
+Download Python 2.6 and install it. 
+<http://www.python.org>
+
+Add `c:\python26` and `c:\python26\scripts` to your PATH
+
+## Compile and build the binary eggs
+
+Run MingW Shell from start menu, cd to pycrypto-2.4 directory and start the compilation:
+` python build --compile=mingw32`
+
+Build the egg (will be placed in the \dist subdirectory:
+` python -c "import setuptools; execfile('setup.py')" bdist_egg`
+
+## Test the build
+
+Run pycrypto test suite: 
+` python setup.py test`
+
+Download Tahoe-LAFS <https://tahoe-lafs.org/source/tahoe-lafs/releases/allmydata-tahoe-1.9.0.zip>
+
+Extract it to a short path without spaces (e.g. C:\). Run the test suite:
+`c:\> python setup.py test`
+
+
+## Instructions for Python 2.7
+
+Python 2.7 are build in the same way: 
+Download Python 2.7 and install it 
+<http://www.python.org>
+
+Remove `c:\python26` and `c:\python26\scripts` from your PATH.
+Add `c:\python27` and `c:\python27\scripts` to your PATH
+
+Compile and test pycrypto-24 in the same way as for Python 2.6.