AntichessProofEngine is an antichess engine for windows that plays perfectly. It supports both UCI and XBoard.
The engine reads proof files for Antichess and plays the best move. There are also wrappers for UCI and XBoard.
The engine requires PARSE_WIN.exe, which can be found here, by downloading LOSING_CHESS64.rar. It also requires proof files, which can be found here and here. The default proof file is e3wins.rev4.
Thanks to fishnet which was modified to be able to communicate with PARSE_WIN.exe.