Twain Driver for Windows 3.1 and Windows 95.  Tested by copying all files to hard disk, see file list photo.  Windows 95 drivers may work for Windows 98 and Me.

For Adaptec AHA-1540B/1542B SCSI interface

For Mustek models: MFC-600S, MFC-800S, MFC-6060S, MFC-12000S, MFS-600SP, MFS-800SP, MFS-6060SP, MFS-12000SP.  As listed in INSTALL.INF file.