How to install 32-bit or 64-bit applications on 64-bit Windows

This article describes how to use Actual Installer to install 32-bit or 64-bit programs on 64-bit Windows operating systems.

Actual Installer creates 32-bit installation packages that can install both 32-bit and 64-bit applications.

As you know, on 64-bit Windows there are two variants of system folders and registry keys:
Program Files directory:
'C:Program Files' is for 64-bit apps
'C:Program Files (x86)' is for 32-bit apps
System directory:
'C:WindowsSystem32' is for 64-bit files
'C:WindowsSysWOW64' is for 32-bit files
Registry Key:
'HKEY_LOCAL_MACHINESOFTWARE' is for 64-bit apps
'HKEY_LOCAL_MACHINESOFTWAREWOW6432Node' is for 32-bit apps

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To access these paths in Actual Installer use variables<ProgramFiles> and <SystemDir>, which will contain the appropriate paths, depending on the bitness of Windows and the option Required OS - 64-bit only (on the General Requirements page).

So if your application is 64-bit, then all you have to do in the Actual Installer project is to select the 64-bit only option.
In this case variables return:
<ProgramFiles> - C:Program Files
<SystemDir> - C:WindowsSystem32
The registry key HKEY_LOCAL_MACHINESoftware will also direct to the correct 64-bit key.

Wow6432node Windows 10

If the 64-bit only option is NOT selected, then:
<ProgramFiles> = C:Program Files (x86)
<SystemDir> = C:WindowsSysWOW64
HKEY_LOCAL_MACHINESOFTWARE will direct to HKEY_LOCAL_MACHINESOFTWAREWOW6432Node

NOTE:
If you use full path 'C:WindowsSystem32' (no variables) for installing files in WindwsSystem folder on 64-bit Windows (and the option '64-bit only' is not selected ), it will automatically be redirected to 'C:WindowsSysWOW64', because of the Windows subsystem WoW64 (Windows 32-bit on Windows 64-bit). More information about this system is described here.
To access this 64-bit folder 'C:WindowsSystem32' from a 32-bit application, with the option '64-bit only' unselected, the following path should be used, instead of C:WindowsSystem32:
C:Windowssysnative
or (using variable):
<WindowsDir>sysnative
Also please note, that on 32-bit Windows access to this path will fail.
The same effect takes place when accessing the registry key 'HKEY_LOCAL_MACHINESOFTWARE'. WOW64 will redirect it to 'HKEY_LOCAL_MACHINESOFTWAREWOW6432Node'.
But Actual Installer can handle this - there is an option Registry Bitness when adding a registry entry (page System Registry).

To access a 64-bit folder 'C:Program Files' from a 32-bit installation, you can use a variable <ProgramFiles64>.

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