check file availablity

["Safir187" <webforumsuser@xxxxxxxxxxxxxx>]

i need a code snippet.
 i wrote this code but it does not work. its my first time:

 on prepareMovie()
   objFileio = new xtra("fileio")
   objFileio.openFile("@\test.txt",1)
   if (objFileio.status=ERROR) then
     exitTheProgram()
   else
     Continue()
   end if
 end