FSCTL_GET_VOLUME_BITMAP Query

hello everybody

I require in my program to find used and unused clusters information
of FAT32 and NTFS for windows 98,Me

I am able to get this by using FSCTL_GET_VOLUME_BITMAP for windows2000/xp

do FSCTL_GET_VOLUME_BITMAP works for windows 98/Me.

If not then how the defragmenting tools for windows 98/Me get the
information of used and unused cluster information of the drives.

i am really stuck up at this point.

do help me

santosh k