If Win98 is the only OS on the system, and if the hard drive is in the same system, you could get
NTFS for Windows 98 from the
Sysinternals site, OR you could boot to DOS and use
NTFS for DOS read-only freeware from the same people, OR you could do a temporary install of NT4 to the NTFS hard drive and use that OS to copy the files over to the Win98 partition, but that would only work for a FAT16 (NOT a FAT32) partition. If you have sufficient unpartitioned space somewhere on the system (or can stick another unpartitioned drive in the system), you can partition it FAT16, and use the aforementioned NT4 installation to copy the files to it. Or you could stick the drive in another system with an OS that can read NTFS and network the two machines so that you could copy the files using the network shares. There are a lot of possibilities.
That NTFS for DOS idea is probably the best and easiest to implement, but I don't know quite enough about your exact situation to be absolutely certain.
Regards,
Jim