Why don't you create a bat file makedos.bat
containing the following line?
c:\DOS\make.exe %1 %2 %5
and put it in C:\DOS
(or C:\Windows
รจ or make sure that it is in your %path%
)
You can run from cmd, SET and it displays all environment variables, including PATH.
In registry you can find environment variables under:
HKEY_CURRENT_USER\Environment
HKEY_CURRENT_USER\Volatile Environment
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment