SystemLanguageID
The installer sets this variable to the default language ID for the target system, in decimal notation. The language IDs are defined as per Win32 conventions; see Language Identifiers on the MSDN web site.
Usage
Used internally by the all installers. You can refer to it as <SystemLanguageID>. Do not set this variable manually; it is set by all installers during installation.
Related topics
ProductLanguage, UserLanguageID, System information variables