UPX Changelog
What's new in UPX 3.91
Dec 2, 2013- Experimental support for Win64/PE
New in UPX 3.07 (Nov 9, 2010)
- Fixed a newly introduced bug with TLS callbacks in the win32/pe format.
New in UPX 3.04 (Sep 28, 2009)
- optional LZMA compression
- support for BSD systems