OemPnPDriversPath in winnt.sif/riprep.inf Windows 2000 & XP: 4096 bytes Same, but setup started by winnt.exe/winnt32.exe (not booted from CD, but started through DOS/from previously installed Windows): Windows 2000 & XP: 2048 bytes DevicePath key in the registry (REG_EXPAND_SZ): Windows 2000 & XP: 64000 bytes Which implies: no need to worry! As for that UIU crap: if they edit their driver's .inf files, that breaks WHQL signing. LOL. Such a professional product... Like that I could reduce the size of the DriverPacks, at the cost of the WHQL signing. The same thing for renaming the .inf files: that voids the WHQL signing. As for their integration method: you can do it that way with my DriverPacks too, and very easily Just extract all DriverPacks to C:\D, then run SetDevicePath.exe C:\D, et voila. To remove them, simply delete C:\D and then run SetDevicePath.exe again, without any parameters.