Feb 1, 1994
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                     PACKWIN (tm)  Version 1.0

             DOS and Windows Executable File Compressor

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Copyright (c) 1993-1994 by Yellow Rose Workgroup. All Rights Reserved.

PACKWIN compresses Microsoft DOS and Windows programs, to dramatically
reduce their size.  Programs compressed  by PACKWIN  are  functionally
identical to the originals,  only smaller.  For example,  consider the
422k "Setup" that is bundled with MS-Windows 3.1.  PACKWIN  compresses
this file to less than 250k, or 59% of its original size. The smaller,
more efficient programs  save disk space,  LAN overhead,  disk caching
resources and discourage reverse engineering.

PACKWIN inputs a big program and outputs a small one.   The process is
totally automatic and requires no additional drivers and  no modifica-
tion to source code or linking.


How to use PACKWIN
------------------

PACKWIN can run on  MS-DOS or  Microsoft Windows environment.  You can
think of PACKWIN compression process as a "black box": files go in big
and come out small.

There are three steps to compressing a file:

 (1) Specify the file to be compressed.   The file type  must be a DOS
     executable file with "EXE" or "COM" file extension, or  a Windows
     3.1 executable file with the "EXE" or "DLL" file extension.

 (2) Specify the compression options. Several compression options allow
     you to get extra compression out of some executable files.

 (3) Start the compression. This stage may take a long time with large
     executable files, but loading time is short.

After these steps, you have a compressed executable. The uncompressed
file has been renamed with the filename extension "OLD."

The compression algorithm used by PACKWIN is the standard public domain
LZ method.



Compression Options
-------------------

Before the file is compressed, you have several compression options
that can be used to get extra compression.  The default compression
options automatically selected  by PACKWIN should suffice  for most
applications.

There are some options:

  (1) Disable compress bitmap resources. Bitmaps typically yield the
      best overall compression in the executable.

  (2) Disable Compress other system resources. This option helps the
      compression. The "other" resources include: Menus,Dialog boxes,
      String Tables, and others. The resource types not included are
      the types that provide status information to external programs,
      such as version info resources and icons.

  (3) Disable compress winstub program.

  (4) Only compress Microsoft Windows Applications.

  (5) Only compress MS-DOS Applications.



Files that can't be compressed
------------------------------

Although  the PACKWIN technology  successfully  compresses the over-
whelming majority of programs without difficulty,  some programs are
not good candidates for compression.

The best strategy is to compress the file and then see if the packed
file loads up. If it don't work,  it cann't be compressed, you would
delete it and restore this file from "OLD" file.

Factors that disqualify compression:

  o Files must be DOS or Windows 3.1 executable files. Files that
    are not "New Executable" files, such as Windows NT  "Portable
    Executables" cannot be compressed.

  o Files cannot access their own disk file image. If you need to
    store data, don't store it in your EXE image.

  o Files cannot have a proprietary file format.    Since PACKWIN
    relies on the standard Windows file format, it can't compress
    a file that has  a proprietary or  self-loading format.  This
    includes files that are already compressed by PACKWIN.

Files  cannot  contain symbolic debugging information.  If symbolic
debugging information is detected,  PACKWIN  will  not proceed with
compression. This is a useful feature, since you know that programs
compressed with PACKWIN do not aid and  abet reverse engineering of
your technology.



Benefits of registration
------------------------

PACKWIN is Shareware, and if you use PACKWIN regularly we strongly
encourage you to register it.  With registration you will receive
the latest version of the software, a comprehensive printed manual,
one free upgrade of PACKWIN, an optional Authenticity Verification
Name and Serial Number.

Also included in the registered version are several utility programs
not provided in the Shareware version.



Copyright Issues
----------------

Modification of a copyrighted work require authorization from the
copyright holder.

For more information, please contact us.

                     Mr. Lei Jun
                     4/F 22 Zhichun Rd.
                     Haidian, Beijing
                     P.R.China, 100088

                     Tel: (86)-1-2049624
                     Fax: (86)-1-2061869

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