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InstallShield 2015 » InstallScript Language Reference
The FOLDER_APPDATA system variable stores the fully qualified path to the folder that is defined by the operating system and that serves as a common repository for application-specific data.
This system variable is read-only; if you attempt to assign a value to it, a compiler error results. The value of this system variable is shared among object scripts and between object scripts and the main setup script.
Project: During setup initialization in InstallScript installations, the value of the FOLDER_APPDATA variable is obtained by calling the Windows API function SHGetSpecialFolderPath with the CSIDL_APPDATA value for LPITEMIDLIST.
In Basic MSI and InstallScript MSI installations, the value of the FOLDER_APPDATA variable is initialized based on the Windows Installer property AppDataFolder or LocalAppDataFolder. Note that deferred, commit, and rollback custom actions do not have access to these properties. Therefore, the corresponding FOLDER_APPDATA variable is empty in deferred, commit, and rollback custom actions. To learn more, see Accessing or Setting Windows Installer Properties Through Deferred, Commit, and Rollback Custom Actions.
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