>Your point is well taken but, the reason I need know this is to determine whether my open error is being cause my this file already being opened and not properly closed. In this case all you get is a -1 handle and ferror() returns and message telling you that there has been an open error. All I need to know is whether my file failure is due to the file already being opened or not.
Juan,

You can write some defensive code around your FOpen() as in;

IF FILE("MyFile.txt")
   lnHandle = fOpen("MyFile.txt")
   IF lnHandle < 0
      * You know the file exists so it must be another problem
   ENDIF
ELSE
   lnHandle = fCreate("MyFile.txt")
   IF lnHandle < 0
      * There was a creation error
   ENDIF
ENDIF