My Old PPC is working now

In Last post I stated how to connect a old PPC with Linux. After I was success to do that, it is obviously that Linux use a generic driver to connect PDA USB port.
So, the problem is why there r so many different PDA Windows driver from different vendor? Maybe these driver are the same except for some vendor identification.
Base on this assumption, I downloaded a driver from toshiba, and then modify the WCEUSBSH.INF file come with it.
Then, when I plugin the PDA, and windows prompt to choose driver for it, I let windows install the driver based on the WCEUSBSH.INF . Lucky, my old PDA is working with windows now.
Cheers