East Asian language first character not recognized in DataGrid cell

This article helps you resolve the problem where the first input character for East Asian languages isn't recognized correctly in DataGridView cell on Windows 10.

Original product version:   Windows 10
Original KB number:   4563779

Symptoms

The first input character for East Asian Languages isn't recognized correctly by IME in DataGrid cell.

Cause

The input composition for Edit control doesn't include the first character typed into the DataGrid cell. The text entered could therefore be incorrect. The Edit control content must be cleared to ensure the correct text is entered. This is an application compatibility issue. Changing compatibility registry is workaround.

Resolution

For more information about how to back up and restore the registry, see: How to back up and restore the registry in Windows.

There are two registry keys to address this problem. Customers can apply one of the following registry key to the system.

Consider the following scenario.

• If you have multiple applications that encounter this problem, and each application has a different Window Class name for each DataGrid cell. In this case, you can add the new registry key, which contains an executable file name of application. Then, you can set the value to 0x00008000. You'll need to repeatedly set up the registry keys for every single application.

• If you have multiple applications that encounter this problem but your applications use single-Window Class name for DataGrid cell because all of those applications' Window Class names are the same. In this case, you can add AppCompatClassName registry key. Then, you can set the value to Window class name of your application.

1. For specific process name:
   Registry entry

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CTF\Compatibility\<ExecutableFileName>
   REG_DWORD: Compatibility
   DWORD Value: 0x00008000 (Hex value of 32,768)

   If x86 applications are executed on a x64 Windows system, the following registry key can be applied instead of the one mentioned previously:

   HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\CTF\Compatibility\<ExecutableFileName>
   REG_DWORD: Compatibility
   DWORD Value: 0x00008000 (Hex value of 32,768)

   For example: The workaround for a specific executable file name such as sample.exe

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CTF\Compatibility\sample.exe
   REG_DWORD: Compatibility
   DWORD Value: 0x00008000 (Hex value of 32,768)

2. For specific Windows class name:
   If you use this scenario, you have to apply the following Windows Updates on your system.

   Windows 10 Version	Article link
   Windows 10 Version 1803	KB4550944
   Windows 10 Version 1809	KB4550969
   Windows 10 Version 1903	KB4541335
   Windows 10 Version 1909	KB4541335
   Windows 10 Version 2004	KB4571744

   Registry entry:

   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CTF\Compatibility\AppCompatClassName
   REG_SZ: Compatibility
   String Value: <WindowClassName>

   If x86 applications are executed on an x64 Windows system, the following registry key can be applied instead of the one mentioned above:

   HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\CTF\Compatibility\AppCompatClassName
   REG_SZ: Compatibility
   String Value: <WindowClassName>

   For example: The workaround for specific Window Class Name as Edit

   KEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\CTF\Compatibility\AppCompatClassName
   REG_SZ: Compatibility
   String Value: Edit

References

Learn about the terminology that Microsoft uses to describe software updates.