how do I copy/move sparse files keeping them sparse?

I'm trying to copy a couple of sparse files from one NTFS5 volume to another NTFS5 volume on Windows XP Professional.
Unfortunately on the target volume the files become solid taking up much more disk space. I have tried using Windows Explorer, "copy" and "xcopy" without any success. Even if I copy the files to another folder on the same volume they lose their sparseness.
Is this the intended behaviour? Are the built-in tools such as Explorer unaware of sparse files? Do I need a special tool to copy sparse files?
Any help appreciated!

Regards
Ralf
.

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