Windows NT versions include the ability to use forks in the API, and some command line tools can be used to create and access forks, but they are ignored by most programs, including Windows Explorer and the DIR command. Windows Explorer copies forks and warns when the target file system doesn't support them, but only counts the main fork's size and it doesn't list a file or folder's streams. The DIR command has been updated in Vista to include an option that will list forks. (FROM WIKIPEDIA)
HIDE YOUR FILES INTO ANOTHER FILE USING THE MICROSOFT NTFS exploit
ALTERNATE DATA STREAMS...!
UPDATED VERSION NOW ACTUALLY WORKING TO ALL KINDS OF FILETYPE
--BUGFIXED EXTRACTION OF ADS IS FULLY FUNCTIONAL
--ADDED LADS ADS DETECTION UTILITY
--REESTABLISHED FILE PATHS FOR PORTABLILITY