The Compact command-line offers more control over file and folder compression than Windows Explorer. For example, you can use the Compact command with a batch script or to compress only files that meet a specific criterion (for example, all the DOC files in a specific folder).

compact filename
compact /u filename

Option	Purpose
/C	Compresses the specified file or folder
/U	Uncompresses the specified file or folder
/S:dir	Specifies which folder should be compressed or uncompressed
/A	Displays any files that have hidden or system file attributes
/I	Indicates that any errors should be ignored
/Q	Reports only critical information, when used with reporting
/?	Displays help