http://www.stefan2000.com/darkehorse/PC/DOS/Drivers/USB/mhairu.zip
http://panasonic.co.jp/pcc/products/drive/cdrrw/kxlrw40an/driver/kxlrw40an.exe
Step 1. Make a Windows 98 boot disk. I don't need to explain the specific method again, right!
Step 2. Download the two files Mhairudos and Kxlrw40an, then extract Mhairudos.zip and pull out the Di1000dd.sys file from it for later use; Kxlrw40an.exe is a self-extracting archive, and after running it it will create the F2H directory. Copy the files RAMFD.SYS, USBCD.SYS, and Usbaspi.sys from that directory, together with the Di1000dd.sys file you just got, to the root directory of the boot disk.
Tip: The Di1000dd.sys file is a driver for USB devices in the DOS environment, while the files RAMFD.SYS, USBCD.SYS, and Usbaspi.sys come from a DOS-environment USB device application solution developed by Panasonic in Japan in 2003. It was originally intended for use on Panasonic's own devices.