http://www.videohelp.com/tools/Simple-x264-Launcher
"Simple x264 Launcher is a very simple GUI for x264 encoder that (not only) allows using 64-Bit x264 with 32-Bit Avisynth. The GUI supports 32-Bit operating systems now, but Benchmarking will be disabled on such systems for obvious reasons. Furthermore the latest version now includes support for FFMS2 input, i.e. if desired you can now open media files directly without Avisynth in between. Video only encoder. "
Info - http://forum.doom9.org/showthread.php?t=144140
From the ReadMe.txt file:
5. Portable Mode
----------------
This application can be run in "portable" mode. Just rename the EXE
file to 'x264_launcher_portable.exe' in order to trigger portable mode.
In that mode all configuration files will be saved in the same folder
where the EXE file resides...
