Microsoft introduced NTFS compression with Windows NT. See my User Tip #142: Windows NT NTFS Directory
Compression for details on NTFS compression. Windows XP introduces zip-type
compression for files or folders in addition to NTFS compression. The
compression is standard zip format. It should be, Microsoft uses licensed code
based on WinZIP 7. If you use XP to zip a files or folders, any standard zip
utility can unzip it.
To zip using native XP, right-click the a list of files or a folder and
choose SendTo|Compressed (Zipped)
Folder. It does not do a compression in place like NTFS compression does
but creates a compressed copy of the original with a zip extension. The explorer
icon for the item will show a zipper up the middle of the icon (cute).
Did a quick test zipping the is-it-true.org folder which is currently 75MB.
Compressed the mostly text documents down to 50MB.
The zip functionality seems quite complete. You can even password protect a
zip. To assign a password to a Windows XP zip :
- Double-click zip to open it
- Click File
- Click Add a Password …
you store on your HD or email to others.