As I know, now the IOS openvpn client version uses PolarSSL instead of OpenSSL, however the pre-ready installer of Windows is for OpenSSL only. Also, the preparation for building Windows .exe from source code is not easy (Tried but not yet found instruction in details for buidling 2.4 version
). Thus, may I suggest to provide Windows' installer with support PolarSSL ? That is much appreciated. 
Thanks a lot,
Andy