Developers can use Windows Installer 5.0 to author a setup file consisting of a single installation package that is capable of either per-machine or per-user installation of the application. It is thus easy to create a dual purpose package for installing applications in windows 7 and Windows Server 2008 R2.
This package can also be installed on computers running Windows Installer 4.5 or earlier. When the dual purpose package is installed on such computers, the “MSIINSTALLPERUSER” property is ignored by the previous versions of the Windows installer. Though the files and registry entries will be installed in locations accessible by other users, the package will require the computer to display UAC prompts for appropriate credentials.Thus, per user installation of software can only be achieved in Windows 7 that has the Windows installer 5.The other major feature introduced in Windows Installer 5 is the ability to author MSI packages that can secure Windows Services, new accounts, files, folders and registry keys.
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The newly introduced “MsiLockPermissionsEx” table facilitates this security. To secure a registry key, file or a service, the object’s unique identifier must be specified in the table. Since this table is meant as a replacement for the “LockPermissions” table, they cannot co-exist and the installation will fail with error 1941. A package written for windows installer 5.0 can contain references to only “MsiLockPermissionsEx” table.
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All the earlier versions of Windows Installer i.e. Versions 4.5, 3.1 etc. Will ignore this table. Thus, it is only possible to secure resources in computers running windows 7 and Windows Installer 5.The other major feature introduced in Windows Installer 5.0 is the ability to enumerate all components installed on the computer and obtain the key path to each component.