Here's a copy of the contents of my modified file just to show you how it looks on an AMD system. I would think that you are along the right lines with [Models.NTintel64] it seems logical to me too. It's not too tricky but Win 7 may not allow you to replace the file so you may have to turn off UAC to accomplish this. Hope it works for you.
[Version]
Signature="$CHICAGO$"
Class=Image
ClassGUID={6bdd1fc6-810f-11d0-bec7-08002be2092f}
LayoutFile=Layout.inf, Layout1.inf, Layout2.inf
Provider=%Msft%
DriverVer=08/28/2001,3.0.0.0
CatalogFile=vis4400.cat
[ControlFlags]
ExcludeFromSelect=*
[SourceDisksNames]
159="Visioneer PnP Drivers",,,
[SourceDisksFiles]
pmicro.dll=159,,
viceo.dll=159,,
gl.dll=159,,
e1.ini=159,,
lut.plg=159,,
[DestinationDirs]
DefaultDestDir=11 ; LDID_SYS that is, \windows\system
CopyFiles.Sys32.NTX86=12 ; system32\drivers
CopyFiles.Sys32.WIN=11
CopyFiles.Wia.Win=10,twain_32\vizscan\42 Bit Scanner
[ControlFlags]
ExcludeFromSelect=*
[Manufacturer]
%Mfg%=Models, NTamd64
[Models]
;%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0346
;%G6.CCD.600.E5.2400U2% = Viz.OTPro, USB\VID_0461&PID_0347
;%G6.CCD.600.E5.2400U3% = Viz.OTPro, USB\VID_0461&PID_0363
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0346
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0347
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0363
[Models.NTamd64]
;%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0346
;%G6.CCD.600.E5.2400U2% = Viz.OTPro, USB\VID_0461&PID_0347
;%G6.CCD.600.E5.2400U3% = Viz.OTPro, USB\VID_0461&PID_0363
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0346
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0347
%G6.CCD.600.E5.2400U1% = Viz.OTPro, USB\VID_0461&PID_0363
[Viz.OTPro]
Include=sti.inf
Needs=STI.USBSection
SubClass=StillImage
DeviceType=1
DeviceSubType=0x1
;Capabilities=1
Capabilities=0x00000033
;Events=Viz.OneTouch.Events
DeviceData=Viz.OTProDeviceData
AddReg=Viz.OTProAddReg.NTX86
CopyFiles=CopyFilesPro.Sys32.NTX86
ICMProfiles="sRGB Color Space Profile.icm"
[Viz.OneTouch.Events]
;ButtonDown="%String7%",{3AF297A5-5599-11D2-B17D-0040052FC4F9},*
[Viz.OTProDeviceData]
TwainDS="Visioneer Scan Manager Pro"
Server=local
MicroDriver="pmicro.dll"
UI DLL=sti.dll
UI Class ID={4DB1AD10-3391-11D2-9A33-00C04FA36145}
SpecialInfo="Visioneer Scanner for USB Interface"
PollTimeout=700,1
Resolutions="75, 100, 150, 200, 300, 600"
[Viz.OTPro.Services]
;AddService = pmxscan, 0x00000002, PmxScan.AddService
Include=sti.inf
Needs=STI.USBSection.Services
[Viz.OTProAddReg.NTX86]
HKR,,DeviceType,1,1
HKR,,HardwareConfig,1,4
HKR,,DevLoader,,*NTKERN
HKR,,NTMPDriver,,"usbscan.sys"
HKR,,USDClass,,"{BB6CF8E2-1511-40bd-91BA-80D43C53064E}"
HKCR,CLSID\{BB6CF8E2-1511-40bd-91BA-80D43C53064E},,,"Visioneer USD"
HKCR,CLSID\{BB6CF8E2-1511-40bd-91BA-80D43C53064E}\InProcServer32,,,%11%\wiafbdrv.dll
HKCR,CLSID\{BB6CF8E2-1511-40bd-91BA-80D43C53064E}\InProcServer32,ThreadingModel,,"Both"
;HKR,,USDClass,0,{45CF3205-1885-11D3-9540-0040052FC4F9}
;HKCR,CLSID\{45CF3205-1885-11D3-9540-0040052FC4F9},,0,OneTouch USD Interface
;HKCR,CLSID\{45CF3205-1885-11D3-9540-0040052FC4F9}\InProcServer32,,0,%11%\onetUSD.dll
;HKCR,CLSID\{45CF3205-1885-11D3-9540-0040052FC4F9}\InProcServer32,ThreadingModel,0,Both
[Viz.OneTouchCopyFiles]
;onetUSD.dll
[CopyFilesPro.Sys32.NTX86]
wiafbdrv.dll
pmicro.dll
viceo.dll
gl.dll
e1.ini
lut.plg
[CopyFiles.Wia.Win]
viceo.dll
rtscan.dll
pr42 Bit Scanner.ini
[StrobePr.CopyFiles.Sys32.Win]
vizscan.sys
[Strings]
Msft="Visioneer"
Mfg="Visioneer Hardware"
G6.CCD.600.E5.2400U1 = "42 Bit USB Scanner"
G6.CCD.600.E5.2400U2 = "42 Bit USB Scanner"
G6.CCD.600.E5.2400U3 = "42 Bit USB Scanner"
String7="Button Press"
pmxscan.SvcDesc= "Visioneer USB Kernel"