UPX(the Ultimate Packer for eXecutables)是一个非常全面的可执行文件压缩软件,支持dos/exe、dos/com、dos/sys、djgpp2/coff、 watcom/le、win32/pe、rtm32/pe、tmt/adam、atari/tos、linux/i386等几乎所有平台上的可执行文件, 具有极佳的压缩比,还可以对未压缩的文件和压缩完后进行比较，Free UPX 1.0是它的外壳程序。下载:Free UPX 1.0

The most important features:

    * Compression and decompression executable files (EXE, DLL, OCX, BPL, CPL, SYS, AX, ACM, DRV, TLB and other).
    * Easy acces to all UPX command-line parameters.
    * Displaying detailed informations about compressed files: original file size, compresson ratio, UPX version, compression level and other.
    * Predefined UPX profiles for beginners. Advanced users can define custom profiles.
    * Don't need any installation. Just extract ZIP archive and click fupx.exe file.
    * Portability. This program can be run from portable devices. All settings are written to INI file.
    * Shell integration (optional).
    * 100% freeware! - for commercial and non-commercial use. No limitations, no adware, no spyware.