Cannot get BHO working in 64 bit

It seems it doesn't work for everyone, so, I'll describe what I did to make it work.

1) download the sample project from here: https://github.com/reinaldo13/ie-bho-extension

2) modify RegisterBHO(...) method in BHO.cs

from:

RegistryKey ourKey = registryKey.OpenSubKey(guid);

to:

  RegistryKey ourKey = registryKey.OpenSubKey(guid, true); //we want to write the registry

3) compile the project for AnyCPU: Project properties, select AnyCPU for the platform target.

4) create a .bat like this, adapt yo your path, and copy that aside your outputs dll:

 "c:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" ieextension.dll /codebase "c:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe" ieextension.dll /codebase   

This will register the dll for x86 and x64. This is mandatory to have both version registered otherwise IE won't like it (it will complain the extension is 'incompatible') because it won't be able to start it depending on your IE settings. Note I suppose you can have two different files for each version but .NET's AnyCPU doesn't need that.

5) run that .bat as admin, here is the output when I do this:

"c:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" ieextension.dll /codebaseMicrosoft .NET Framework Assembly Registration Utility version 4.7.2046.0for Microsoft .NET Framework version 4.7.2046.0Copyright (C) Microsoft Corporation.  All rights reserved.RegAsm : warning RA0000 : Registering an unsigned assembly with /codebase can cause your assembly to interfere with other applications that may be installed on the same computer. The /codebase switch is intended to be used only with signed assemblies. Please give your assembly a strong name and re-register it.Types registered successfully"c:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe" ieextension.dll /codebaseMicrosoft .NET Framework Assembly Registration Utility version 4.7.2046.0for Microsoft .NET Framework version 4.7.2046.0Copyright (C) Microsoft Corporation.  All rights reserved.RegAsm : warning RA0000 : Registering an unsigned assembly with /codebase can cause your assembly to interfere with other applications that may be installed on the same computer. The /codebase switch is intended to be used only with signed assemblies. Please give your assembly a strong name and re-register it.Types registered successfully

6) run iexplore.exe. It may work depending on your settings (displays a "HOLA!!!" messagebox), but anyway, go to menu Tools / Internet Options / Programs / Manage add-ons, this is what I see:

If the extension is disabled, you should be able to enable it (and restart).

If it doesn't work (by default it shouldn't), make sure you've checked "Enable 64-bit processes for Enhanced Protected Mode*" (needs restart). To me the message is wrong, it should just say "Enable 64-bit processes"...

Regasm.exe (Assembly Registration Tool) HERE

Check your project settings to compile as 64bit and check IE version as well . and run it in Administrator mode.

Your Code is perfect. just the system settings and compilation configurations are messed up ,

also have a look at this setting https://answers.microsoft.com/en-us/ie/forum/ie11-windows_7/enable-64-bit-processes-in-ie-11/212270df-cc35-4e09-89e4-13b9da1bb6a7?auth=1

Hope this will help you out !!