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64 bit Support

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64-bit Support

64-bit support creates unique issues for windows installer software. QSetup Installation Software version 10 is ready to support those issues.

Microsoft's support for 32/64-bit Operating Systems can be summarized as follows:

System Directory

All 64 bit system DLLs and service programs are placed in the directory System32.

All 32 bit system DLLs and service programs are placed in the directory SysWOW64.

When a 64 bit process is accessing the System directory it is directed to the System32 directory.

When a 32 bit process is accessing the System directory it is directed to the SysWOW64 directory.

Registry

The following registry branches are duplicated:

HKEY_LOCAL_MACHINE\Software

HKEY_USERS\*\Software\Classes

HKEY_USERS\*_Classes

Note * indicates a match for all user security IDs (SID).

Program Files

Microsoft recommends that:

64-bit applications will be installed in the \Program Files directory.

32-bit applications will be installed in the \Program Files (X86) directory.

File System Redirector

Using dedicated WOW64 API functions a 32-bit process can access 64-bit resources and vice versa.

QSetup 64-bit Support

QSetup Installation Software is compatible with the following 64-bit operating systems:

XP.64

Vista.64

Win7.64

Win2008.64

Win8.64

QSetup is a 32-bit application.
QSetup will run as a 32-bit application on any supported X64 operating system.
QSetup will compile 32-bit installation that will install as a 32-bit application on native 32-bit operating systems and on any supported X64 operating system.
QSetup can also compile 64-bit setup(s) to be installed on any supported X64 operating system.

QSetup Installation Software contains a special switch: Create 64-bit Setup.

When this switch is checked, the setup will be installed as a 64-bit application, thus addressing the 64-bit System Directory, the 64-bit Registry Branches and will propose the "\Program Files" directory as the installation location.
Of course a 64-bit setup can be installed only on one of the supported 64-bit operating systems.

When this switch is unchecked (default), QSetup will create a 32-bit setup that will be installed as a 32-bit application thus addressing the 32-bit System Directory, the 32-bit Registry Branches and will propose the "\Program Files (X86)" directory as the installation location.

Accessing 64-bit resources from 32-bit installations and vise versa
Using the following "Execute" conditions and commands a 64-bit installation can access 32-bit resources and vice versa:

Set 64 bit State
Set 32 bit State
Restore Original Setup State
Running on 64 bit OS
64 bit State is ON

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