Explorer.exe crash when right click->New

Hi,
I have a windows 10 computer which crashes when I right click and open the "new" submenu.
I already tried to :
- disable all non microsoft shell extension with ShellExView
- try in safe mode (same issue)
- run sfc /scannow and dism repair

I found out that if I edit "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Discardable\PostSetup\ShellNew \Classes" to remove DOCX or rename DOCX to docx it fixes the issue. BUT, this change is overwriten each time I open this "new" right click menu, so it only works one time.
A solution could be to make this change permanent but I don't know how...

Here is a crash dump analysis from osronline :

Code:

*** WARNING: Unable to verify timestamp for sppc.dll
*** ERROR: Module load completed but symbols could not be loaded for sppc.dll
*** WARNING: Unable to verify timestamp for DropboxExt64.18.0.dll
*** ERROR: Module load completed but symbols could not be loaded for DropboxExt64.18.0.dll
*** WARNING: Unable to verify timestamp for ashShA64.dll
*** ERROR: Module load completed but symbols could not be loaded for ashShA64.dll
TRIAGER: Could not open triage file : e:\dump_analysis\program\triage\modclass.ini, error 2
GetUrlPageData2 (WinHttp) failed: 12029.
*** The OS name list needs to be updated! Unknown Windows version: 10.0 ***

FAULTING_IP: 
shell32!CheckFileTypeForShellNew+32
00007ffe`a84b5616 488b03          mov     rax,qword ptr [rbx]

EXCEPTION_RECORD:  ffffffffffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 00007ffea84b5616 (shell32!CheckFileTypeForShellNew+0x0000000000000032)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: 0000000000000000
Attempt to read from address 0000000000000000

PROCESS_NAME:  explorer.exe

ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at "0x%08lx" referenced memory at "0x%08lx". The memory could not be "%s".

EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at "0x%08lx"  referenced memory at "0x%08lx". The memory could not be "%s".

EXCEPTION_PARAMETER1:  0000000000000000

EXCEPTION_PARAMETER2:  0000000000000000

READ_ADDRESS:  0000000000000000 

FOLLOWUP_IP: 
shell32!CheckFileTypeForShellNew+32
00007ffe`a84b5616 488b03          mov     rax,qword ptr [rbx]

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

FAULTING_THREAD:  0000000000002528

BUGCHECK_STR:  APPLICATION_FAULT_NULL_POINTER_READ_AFTER_CALL

PRIMARY_PROBLEM_CLASS:  NULL_POINTER_READ_AFTER_CALL

DEFAULT_BUCKET_ID:  NULL_POINTER_READ_AFTER_CALL

LAST_CONTROL_TRANSFER:  from 00007ffea84b65b8 to 00007ffea84b5616

  SYMBOL_STACK_INDEX:  0

SYMBOL_NAME:  shell32!CheckFileTypeForShellNew+32

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: shell32

IMAGE_NAME:  shell32.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  0

STACK_COMMAND:  ~77s; .ecxr ; kb

FAILURE_BUCKET_ID:  NULL_POINTER_READ_AFTER_CALL_c0000005_shell32.dll!CheckFileTypeForShellNew

BUCKET_ID:  X64_APPLICATION_FAULT_NULL_POINTER_READ_AFTER_CALL_shell32!CheckFileTypeForShellNew+32

WATSON_STAGEONE_URL:   http://watson.microsoft.com/StageOne/explorer_exe/10_0_15063_447/951324bb/shell32_dll/10_0_15063_502/944613c6/c0000005/00435616.htm?Retriage=1

I removed docx with this software but it did not change the ShellNew \Classes value and the crash still happens

Well, the problem disappear if I manualy remove docx extension from the shellnew registry... until it is added again by windows.
I do not have a relevant restore point.
I will test a new user later.

Please find below the report, I see no errors
I also tried a new user it works fine, but there is no .DOCX in registry. So the issue remains : how to remove it from my current account. Or what else can I do ? The new menu editor dalchina suggested does not change the ShellNew registry, but changes value elsewhere.
Thanks.

Code:

Windows Diagnostic Information
------------------------------

Tool Version: 10.0.15063.0
Licensing Status: Licenced
Licensing Status Reason: 0x4004F401
Local Genuine State: Genuine
Local Genuine Result P: 1
Last Online Genuine Result: 0x00000000
Grace Time Minutes: 0
Total Grace Days: 0
Validity Expiration: 
Active Partial Product Key: F6YK4
Active Product Key Pid2: 00325-95885-16799-AAOEM
O S Version: 10.0.15063.2.00010300.0.0.101
Product Name: Windows 10 Home
Processor Architecture: x64
Edition Id: Core
Build Lab: 15063.rs2_release.170317-1834
Time Zone: Paris, Madrid(GMT+02:00)
Active Sku Id: 8db63db6-4f8f-46d6-a448-66444faaaa72
Active Sku Description: Windows(R) Operating System, OEM_DM channel
Product Uniqueness Groups: 55c92734-d682-4d71-983e-d6ec3f16059f
Active Product Key P Key Id: 2045a198-062d-5f61-c8dc-7f337ad7b895
Active Product Key Pid Ex: 03612-03259-588-516799-02-1036-15063.0000-2432017
Active Product Key Channel: OEM:DM
Active Volume Customer Pid: 
Offline Installation Id: 269497590915452156012357192015382210660211872767222425510106404
Domain Joined: false
Computer Sid: S-1-5-21-2499206201-2461669800-726101907
Product L C I D: 1036
User L C I D: 1036
System L C I D: 1036
Code Signing: SIGNED_INFO_PRS_SIGNED
Service Available: true
Oem Marker Version: 
Oem Id: 
Oem Table Id: 
O A3 Product Key: 7D96M-8NVTW-VW6GV-TJ4PR-F6YK4
Manufacturer: HP
Model: HP Pavilion Gaming Notebook
Install Date: 20170831101432.000000+120
Result: PASS
Tampered Items: 
Server Props: GenuineId=55c92734-d682-4d71-983e-d6ec3f16059f;OemId=0000064397;OptionalInfoId=+p7ApsH3aZ357NpWNJQHluUn2P/ZO8OCoUSwNWsn/nGg3lO5jJk7m7s44NU//PcU;Pid=voVvDbBuLPn+e39K/8KiYKQDaMD0pA1eUSjLhGkg3/4=;SkuId=8db63db6-4f8f-46d6-a448-66444faaaa72;TimeStampServer=2016-04-06T06:29:38Z;

****** Errors from Event Log *****
No Security SPP Event Log errors found

------------------------------------------------
Created by Superfly for EightForums & TenForums

I am not sure : does changing file association affects the "new" menu ?