This article details how a developer can set up the Subversion command line client svn and PuTTY on MS Windows to enable write access to the KDE Subversion Repository, using your existing SSH credentials from *nix.
In order for MS Windows to be able to find PuTTY and its related executable files, you need to add their location to your PATH variable. By default, puTTY will install to C:\Program Files\PuTTY. To edit your PATH (for Windows >= Win2k), Start -> Control Panel -> System -> Advanced -> Environment Variables -> System Variables -> Path -> Edit. Add "C:\Program Files\PuTTY;" to the end of the PATH variable value.
Copy the private ssh key that is associated with your KDE Subversion account to the MS Windows machine. In many cases this will be /home/kde-devel/.ssh/id_dsa. I put mine in C:\Documents and Settings\mark\My Documents.
In order to use your OpenSSH private key, you must first convert it to a puTTY Private Key (*.ppk). To do this, Start -> All Programs -> puTTY -> puTTYgen -> Load. Browse to wherever you saved your private key (id_dsa) and load it.
Once the key is loaded, click on 'Save Private Key' to save a copy of the key in a version that PuTTY can use. I saved mine as id_dsa.ppk.
putty = plink -ssh -C -i c:\path\to\id_dsa.ppk -agent <svnaccountname>@svn.kde.org
C:\KDE4> svn co svn+putty://svn.kde.org/home/kde/trunk/kdesupport/emerge