The installer sets this variable to the full path of the Common Files folder on the target system. On 64-bit systems, this path refers to the 64-bit folder; on 32-bit systems, it refers to the 32-bit folder.
This path should be used for programs that are neither 32-bit nor 64-bit specific, for example MSIL-based .Net applications.
You can refer to this variable as <CommonFilesXFolder>. Do not change its value; it has been carefully configured for cross-platform compatibility.