You can use WSH (Windows Script Host) http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/wsMthRun.asp

oShell = CREATEOBJECT('WScript.Shell')
oShell.Run(lcMyFile)

or ShellExecute API #12636.

>We have an application that runs as an '.exe' and would like to update the registry with the contents of a file 'abc.reg'.
>Is the 'RUN abc.reg' the correct command to use to perform this task?
>
>TIA.