64-Bit Custom Actions

On 64-bit operating systems, Windows Installer may call custom actions that have been compiled for 32-bit or 64-bit systems.

A 64-bit custom action based on Scripts must be explicitly marked as a 64-bit custom action by adding the msidbCustomActionType64BitScript bit to the custom actions numeric type in the Type column of the CustomAction table.

Constant	Hexadecimal	Decimal	Meaning
msidbCustomActionType64BitScript	0x0001000	4096	This is a 64-bit custom action written in Scripts.

 

Custom actions based on Executable files or Dynamic-Link Libraries that have been complied for a 64-bit operating systems do not require including this additional bit in the Type column of the CustomAction table.