How to recover from an issue in which an Excel file with a macro has an error due to the April update ( Fix update released )

( Translated into English using Google Translator )

This issue is known to be triggered by a security update related update released on April 15.
This issue can be avoided by reverting to the March version.

Microsoft is already aware that this is a security update issue.
There is also an announcement that a fix update is being prepared.

It affects Office365 (Excel) / Excel2019 / Excel2016 / Excel2013 / Excel2010.
Excel 2007 and earlier versions are no longer supported. Therefore, there is
no security update, so it is not affected.

This is a bug related to DBCS characters (Japanese, Korean, Chinese etc.).
Therefore, it is not a problem in the US and Europe.

( May 7  18:00 )

Issue information has been added to the Microsoft troubleshooting list.

Office365(Excel) Fixes or workarounds for recent issues
https://support.office.com/en-us/article/2596-49d932ce-0240-49cf-94df-1587d9d97093

The issue information is below.
Excel/Word/PowerPoint file becomes corrupt when opening a file that
contains a VBA project or after enabling a macro in an open file
https://support.office.com/en-us/article/ad6ee6ca-db23-4614-a403-282821eb99f6

--- Conditions for issue ---
Post thread by Msdn Forum / Office Support Team (Japanese)
https://social.msdn.microsoft.com/Forums/ja-JP/6c3fa724-25c9-408e-bdde-245c9ea1ad8a

(Case A)
The name of the library (DLL) referenced from VBAProject contains DBCS characters.

(Case B)
The name of the Excel file referenced from VBAProject or the storage path of the
file contains DBCS characters.
(In this case, the only referencing file format is Excel 97-2003 format (.xls or .xla).)


(Case C)
As of May 1st, it is not listed in the thread above,
An error occurs in the workbook created with "User account name containing DBCS characters".
The undetermined condition is posted (thread below, Japanese).
https://answers.microsoft.com/thread/121fef4a-e11e-4dfe-86e9-f89dcaa2f245

(In this case, both Excel 97-2003 format / Excel 2007 format are affected)



--- How to revert to the March version ---

(1) Office365 (Excel) / Excel2019 / Excel2016
   (a) C2R version (Click to Run)
         You can recover by rolling back to "16.0.12624.20382" delivered on March 31.
   (b) For MSI version (installer)
         You can recover by uninstalling "KB4484273".


(2) Excel2013
   (a) C2R version (Click to Run)
         You can recover by rolling back to "15.0.5223.1001" delivered on March 13.
   (b) For MSI version (installer)
         You can recover by uninstalling "KB4484283".


(3) Excel2010
    You can recover by uninstalling "KB4484285".

(Note)
Store app version Office cannot be handled by this method.
First, you need to switch to the desktop version (C2R version).
After reinstalling the desktop version, roll back to the March version.




(4) How to roll back to March version with C2R version

  (a) Execute "Command Prompt" as an administrator.
     [Start button > Right-click Command Prompt > Other > Run as administrator]

  (b) Type the following two commands
      (i) Office365(Excel)/Excel2019/Excel2016

          cd %programfiles%\Common Files\Microsoft Shared\ClickToRun
          officec2rclient.exe /update user updatetoversion=16.0.12624.20382

      (ii) Excel2013

          cd %programfiles%\Microsoft Office 15\ClientX64
          officec2rclient.exe /update user updatetoversion=15.0.5223.1001
          (Note)
             [ For 32bit-Windows, ClientX64 -> ClientX86 ]

  (c) After typing 2 commands, the following 3 popups will be displayed in

       sequence for a while.
        [ Downloading Office updates ]
        [ Applying update program    ]
        [ Update program installed   ]

  (d) In order not to update again, after rollback is completed,
      set "Disable update" in [ Account > Update option ].



(5) How to uninstall KB in Excel2019 / Excel2016(MSI version) and Excel2010

  (a) Select the corresponding KB from the list of

       [ Control Panel > Programs > Show Updates ]
       and click the "Uninstall" button

　　　　Excel2019/Excel2016 ： KB4484273
　　　　Excel2013 ： KB4484283
　　　　Excel2010 ： KB4484285

  (b) Use one of the following methods so that it will not be updated again.

     (i) [ Windows Settings > Update & Security > Pause update for 7 days ]

     (ii) Hide the target KB by "Show or hide updates Troubleshooter"
https://support.microsoft.com/en-us/help/3183922

## Since this is not a question, you do not need to reply to this thread. ##

( Translated into English using Google Translator )

( May 6   13:00 )

A fix update has been released for Excel2016 / 2019 & Excel365 ( C2R ).
## Excel2013(C2R)  is still in preparation. ##


Update history
https://docs.microsoft.com/en-us/officeupdates/update-history-office365-proplus-by-date

Version 2004 (Build 12730.20250) : May 4
https://docs.microsoft.com/en-us/officeupdates/monthly-channel-2020#version-2004-may-04

Fixed build number ( general users are Monthly Channel )
Monthly Channel : May 4  Version 2004 (Build 12730.20250)
Semi-Annual Channel   : May 4  Version 1908 (Build 11929.20752)
                                               or Version 1902 (Build 11328.20572)

## Semi-Annual Channel (Targeted) is still in preparation. ##

After updating to "Enable update" in "Account> Update options",

select "Update now" to update.



After confirming with Excel2016, it is sure that the workbook with "External reference of file name including DBCS characters" can be read safely without erasing macros.


In addition, we have not been able to verify whether there is a correction for the report that an error occurs even in "Workbook created with user account name containing DBCS characters".

The release comment only mentions the case "file name or path name contains DBCS characters", not "user account name containing DBCS characters". It may not have been done yet.

( Translated into English using Google Translator )

( May 11   11:30 )
A fix update for Office2016(MSI) / 2013(MSI) / Office2010(MSI)

has been released.
## Office2013(C2R) is still in preparation. ##

Office2016 ( MSI )
May 8, 2020, update for Microsoft Office 2010 ( KB3101353 )

https://support.microsoft.com/en-us/help/3101353

Office2013 ( MSI ) .... ## C2R version is still in preparation. ##
May 6, 2020, update for Microsoft Office 2013 ( KB2986208 )
https://support.microsoft.com/en-us/help/2986208

Office2010 ( MSI )
May 7, 2020, update for Microsoft Office 2010 ( KB3015640 )
https://support.microsoft.com/en-us/help/3015640


Because the update program was released as an emergency response,
As of May 8, it has not been released to Windows Update.
Get the update installer from the KB link above.