Calling an OS (Shell) command

I've been doing this, don't know which is better.

Extern "Win32"
	Function _WinExec(lpCmdLine:Byte Ptr,nCmdShow:Int)="WinExec@8" 
End Extern

Shell("replacewithan.exe /yeppers")

Function Shell(sCMD:String)
	Local iShow:Int=3
	_WinExec(sCMD.ToCString(),iShow)
End Function