高手看看 关于CLassGuid

下面的INF文件怎么没有ClassGuid选项呀  这样驱动怎么调用设备呀  
(这个INF文件是我使用过的  可以正常安装和驱动设备)

[Version]
Signature="$CHICAGO$"
Class=USB
provider=%PHILIPS%
LayoutFile=layout.inf

[Manufacturer]
%MfgName%=Philips

[Philips]
%USB\VID_0471&PID_0222.DeviceDesc%=D12TEST.Dev, USB\VID_0471&PID_0222
%USB\VID_0471&PID_0666.DeviceDesc%=D12TEST.Dev, USB\VID_0471&PID_0666
%USB\VID_0471&PID_0888.DeviceDesc%=D12TEST.Dev, USB\VID_0471&PID_0888

[PreCopySection]
HKR,,NoSetupUI,,1

[DestinationDirs]
D12TEST.Files.Ext = 10,System32\Drivers
D12TEST.Files.Inf = 10,INF

[D12TEST.Dev]
CopyFiles=D12TEST.Files.Ext
AddReg=D12TEST.AddReg

[D12TEST.Dev.NT]
CopyFiles=D12TEST.Files.Ext
AddReg=D12TEST.AddReg

[D12TEST.Dev.NT.Services]
Addservice = D12TEST, 0x00000002, D12TEST.AddService

[D12TEST.AddService]
DisplayName    = %D12TEST.SvcDesc%
ServiceType    = 1                  ; SERVICE_KERNEL_DRIVER
StartType      = 2                  ; SERVICE_AUTO_START
ErrorControl   = 1                  ; SERVICE_ERROR_NORMAL
ServiceBinary  = %10%\System32\Drivers\D12TEST.sys
LoadOrderGroup = Base

[D12TEST.AddReg]
HKR,,DevLoader,,*ntkern
HKR,,NTMPDriver,,D12TEST.sys
HKLM,"System\Currentcontrolset\Services\D12TEST\Parameters","MaximumTransferSize",0x10001,65536
HKLM,"System\Currentcontrolset\Services\D12TEST\Parameters","DebugLevel",0x10001,2


[D12TEST.Files.Ext]
D12TEST.sys


;---------------------------------------------------------------;

[Strings]
PHILIPS="Philips Semiconductors"
MfgName="Philips"
USB\VID_0471&PID_0222.DeviceDesc="Philips PDIUSBD12 Evaluation Board"
USB\VID_0471&PID_0666.DeviceDesc="Philips PDIUSBD12 SMART Evaluation Board"
USB\VID_0471&PID_0888.DeviceDesc="Philips PDIUSBD12 USB-EPP Evaluation Board"
D12TEST.SvcDesc="D12TEST.Sys PDIUSBD12 Bulk IO test driver"

用的是VID和PID