RegMDAC
This is a helper variable that defines the registry key under which MDAC (Microsoft Data Access Components) information can be found. It is used by other variables to retrieve information about MDAC.
Usage
You can refer to this variable as <RegMDAC>. Because it is a registry path, it is typically used as <@<RegMDAC>\...additional path...>. Do not change its value; it has been carefully configured for cross-platform compatibility.