The DTC-3181 SCSI card came in a bundle with several scanner variants, including the Mustek Scanexpress 12000SP. Since it took me several days to find this miserable driver (the others all didn't support up to W98) I thought it might prove generally interesting for others. To install unpack it, then use the add/remove hardware option and add a SCSI controller, choose 'Have Disk' and use the .inf file from the unpacked driver folder. NOTE to get the Mustek scanner to work you will need another driver for the scanner itself the file name is d12spplc10.exe and can be found on the Mustek or Chaintech sites. Install it and then reboot, the scanner will be configured automatically if the SCSI card is functioning (check this in the devices list in configuration/system).