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Microsoft Resource Kits - Windows 2003 Resource Kit

Compress.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
Compress.exe - Compress Files
Compress is a command-line tool that can be used to create compressed copies of one or more files. Works in Windows XP/2000/2003.

Switches: /r - Renames expanded files. Compressed files are renamed with the last character in the file name extension set to an underscore ("_") character. The underscore identifies the file as a compressed file.
/d - Only out of date files within the destination are updated.
/zx - Specifies LZX compression.
/z - Specifies MS-ZIP compression (AKA .cab file format).
/zq[n] - Specifies quantum compression. Valid values for n are in the range 1 to 7 (1 yields the fastest speed while 7 gives best compression). The default value for n is 4.
Source - Specifies the source file.
Destination - Specifies the destination file or path