This driver was manufactured by Alcor Micro®. It will work in Windows® 98/98SE. It will work for both USB 1.0 and 2.0. It can be used for a Rosewill® RDS-CR100 Card Reader and can also be used for an X Digital Media® XAS361A SD/MMC USB Card Reader. Included in the X-DigitalMediaXAS361ADriverWin98-98SESetUp.zip is a doc that gives you full instructions on how to install the driver to make an X Digital Media® XAS361A SD/MMC USB Card Reader function in Windows® 98/98SE. Worked great for me (Windows® 98)!