Self-extracting (SFX) OpenPGP files and OpenPGPBlackbox - SecureBlackbox®
Self-extracting archives are executable files (created for certain platform) which can be run and extract their own contents. The code that performs extraction is called "stub". Self-extracting archives can be distributed without necessity to have an unpacker software on the recipient side.
OpenPGPBlackbox lets you create self-extracting OpenPGP archives and provides stubs for Windows and .NET. You can create your own stubs as well (Windows only at the moment).