[Windows Phone 7 Development and Hacking] HD2Owner:
coreos.dat:

;
; Copyright (c) Microsoft Corporation. All rights reserved.
;
;
; Use of this sample source code is subject to the terms of the Microsoft
; license agreement under which you licensed this sample source code. If
; you did not accept the terms of the license agreement, you are not
; authorized to use this sample source code. For the terms of the license,
; please see the license agreement between you and Microsoft or, if applicable,
; see the LICENSE.RTF on your install media or the root of your tools installation.
; THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES OR INDEMNITIES.
;

; WARNING: Do not add additional rules to this file. This file conly contains
; cold-boot file system population rules that cannot be expressed using provxml
; because they are required prior to coldinit execution.

; Set-up required directory structure
root:-Directory("Windows")
Directory("Windows"):-Directory("Security")
Directory("Windows"):-Directory("Keys")
Directory("Windows"):-Directory("System")
Directory("Windows\System"):-Directory("ConfigMgr")
Directory("Windows\System"):-Directory("CertDtls")
Directory("Windows\System"):-Directory("ImageUpdate")
Directory("Windows\System\ImageUpdate"):-Directory("PostImageUpdate")

root:-Directory("Application Data")
Directory("Application Data"):-Directory("Microsoft")
Directory("Application Data\Microsoft"):-Directory("DeviceUpdate")

; The folowing .vol file paths must be kept the same as the
; paths specified in the registry
Directory("Windows\Security"):-File("policydb.vol","\Windows\policydb.vol")
Directory("Windows\Security"):-File("PolicyMeta.xml","\Windows\PolicyMeta.xml")
Directory("Windows\Security"):-File("accountdb.vol","\Windows\accountdb.vol")
Directory("\"):-File("mxip_notify.vol","\Windows\mxip_notify.vol")

another rgu (digital compass mentioned):

REGEDIT4
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\keybd]
"Dll" = "htc_keypad.Dll"
"Prefix" = "KBD"
"Order" = dword:20
"Index" = dword:1
"IClass"=multi_sz:"{A32942B7-920C-486b-B0E6-92A702A99B35}","{4619249B-6362-4520-B700-984C8E7BC7A4}"
"Flags"=dword:00010000
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\KBD]
"Pdd" = "keybdpdd_htc.Dll"
[HKEY_CURRENT_USER\ControlPanel\Keybd]
"InitialDelay"=dword:177
"RepeatRate"=dword:8
"DefaultKeyLock"=dword:1 ; To enable the key lock by default
"ShowWarningMsg"=dword:1 ; To show warning message for complete power off
"MuteSwitch"=dword:1 ; To enable MuteSwitch
"LongEndFunction"=dword:1 ;0:de-activate PDP, 1:device lock
"FrontKeyLEDEvent"="IconLedOnEvent"
[HKEY_LOCAL_MACHINE\Security\Phone\PhoneKeyMatch]
"Wildcard"="none"
[HKEY_CURRENT_USER\Software\Microsoft\Shell]
"HasKeyboard"=dword:0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Keypad]
"IsSlideOut"=dword:0
[HKEY_LOCAL_MACHINE\Software\XT9 Input Method]
"IMEmode"=dword:0
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\Preferences]
"BlockShellLock"=dword:6
"UnattendedPlayback"=dword:1
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Keypad]
"IsCarKitMode"=dword:0
[HKEY_LOCAL_MACHINE\SYSTEM\State\Hardware]
"Headset"=dword:0
[HKEY_LOCAL_MACHINE\Software\HTC\H2W]
"ShowEarphoneIcon"=dword:0
[HKEY_LOCAL_MACHINE\Software\HTC\H2W]
"3_5_mic"=dword:FF
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\MicroP]
"Prefix"="UPC"
"Dll"="MicroP.dll"
"Index"=dword:1
"Order"=dword:2
"Flags"=dword:00010000 ; DEVFLAGS_TRUSTEDCALLERONLY
"IClass" = "{A32942B7-920C-486b-B0E6-92A702A99B35}"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NLed]
"Prefix"="NLD"
"Dll"="nleddrvr.dll"
"Flags"=dword:8 ; DEVFLAGS_NAKEDENTRIES
"Order"=dword:20
"IClass"="{CBB4F234-F35F-485b-A490-ADC7804A4EF3}"
"Index"=dword:1
"Pdd"="nledpdd_htc.dll"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\AllLEDMgr]
"Prefix"="LED"
"Dll"="AllLEDMgr.dll"
"Index"=dword:1
"Order"=dword:22
"IClass"="{4619249B-6362-4520-B700-984C8E7BC7A4}"
-------------------------------------------------------------------------------
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NLed\Config]
"MddPowerManaged"=dword:1 ; Let MDD do power management
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NLed\Config\Vibrator]
"LedNum"=dword:0 ; LED #0
"LedType"=dword:2 ; 2 indicates vibrator
"CycleAdjust"=dword:0 ; dummy indicating we cannot adjust cycle
"SWBlinkCtrl"=dword:0 ; NOT Software decides when to switch ON and OFF
"Blinkable"=dword:0 ; This is not blinkable
[HKEY_LOCAL_MACHINE\Services\NLEDSRV]
"FriendlyName"="NLED service"
"Dll"="nledsrv.dll"
"Order"=dword:9
"Keep"=dword:1
"Prefix"="NLS"
"Index"=dword:0
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NLed\Config\Vibrator\VibratorTestOn]
"Root"=dword:80000002 ; HKLM
"Path"="Drivers\\BuiltIn\\NLed\\TestVibrator" ;
"ValueName"="Status" ;
"Mask"=dword:800 ; Mask value with this to get status
"TriggerValue"=dword:800 ; Compare status with this
"State"=dword:1 ; If above comparison succeeds, vibrator on
"Prio"=dword:1 ; Priority # 1 for this event
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\NLed\TestVibrator]
"Status"=dword:0
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\GSensor]
"Prefix"="ECS"
"Dll"="HTCSensorDrv.dll"
"Index"=dword:1
"Order"=dword:1e	; ALS - 1
"Flags"=dword:00010000 ; DEVFLAGS_TRUSTEDCALLERONLY
"PollingInterval"=dword:64
"ShakingThreshold"=dword:3
"EnableShaking"=dword:0
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
"CalibrateMethod"=dword:000000e7
"SensorEnableMask"=dword:0
"SensorPollingMask"=dword:0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\Unattended]
"ecs1:"=dword:4 ; G-Sensor off when unattended mode
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\State\Resuming]
"ecs1:"=dword:4 ; G-Sensor off when resuming mode
[HKEY_LOCAL_MACHINE\Software\Drivers\GSensor]
"Device"="0.00.01"
"Common"="0.00.01"
[HKEY_LOCAL_MACHINE\Software\HTC\Proximity]
"ProximityDetectStatus"=dword:0 ; 0: PSensor is NOT covered, 1: PSensor is covered
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\DummyMicroP]
"Prefix"="KLT"
"Dll"="HTCSensorDrv.dll"
"Index"=dword:1
"Order"=dword:26
"Flags"=dword:00010000 ; DEVFLAGS_TRUSTEDCALLERONLY
"IClass" = "{A32942B7-920C-486b-B0E6-92A702A99B35}"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Proximity]
"Pdd"="sensorpdd_htc.dll"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\ALS]
"Pdd"="sensorpdd_htc.dll"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Accelerometer]
"Pdd"="accpdd_htc.dll"
"Order"=dword:21
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\DCompass]
"Dll"="DCompass.dll"
"Prefix"="ECS"
"Index"=dword:7
"Order"=dword:21
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\DCompassAPI]
"Dll"="ECD.dll"
"Prefix"="ECD"
"Index"=dword:1
"Order"=dword:23
"IClass"="{A32942B7-920C-486b-B0E6-92A702A99B35}"

other findings:

[HKEY_LOCAL_MACHINE\Software\Microsoft\Zune\MTP\DIBR]
"UserStoreRootPath"="\\"
"EstimatedOsSize"=dword:1D400000 ; 468 MB (450 for IMGFS, 8 for SLDR1, 8 for SLDR2, 2 for NK)