This is from the "help" exe on xp pro. type "how
compress a folder" without the quotes to populate all of
the search results, including instructions for non-NTFS
drive. Good luck Christian. jd.
To compress a file or folder on an NTFS drive
Open My Computer.
Double-click a drive or folder.
Right-click the file or folder you want to compress, and
then click Properties.
On the General tab, click Advanced.
Select the Compress contents to save disk space check
box, and then click OK.
In the Properties dialog box, click OK.
In Confirm Attribute Changes, select the option you want.
Notes
To open My Computer, click Start, and then click My
Computer.
You can only use NTFS compression for files and folders
on drives formatted as NTFS. If the Advanced button does
not appear, the file or folder you selected is not on an
NTFS drive.
If you move or copy a file into a compressed folder, it
is compressed automatically. If you move a file from a
different NTFS drive into a compressed folder, it is also
compressed. However, if you move a file from the same
NTFS drive into a compressed folder, the file retains its
original state, either compressed or uncompressed.