fbOpen()

         Opens a binary file

    Syntax:

         fbOpen( cFile, nMode ) -> nHandle

         cFile : The name of the file
         nMode : DOS open mode

    Description:

         Trys to open the file cFile in mode nModo with 5 retries and begs
         the user to answer if he wants to retry if there's an error.

    Return:

         A file handle or -1 if an error is found.

    Example:

         nHandle := fbOpen ( "Fast.txt", 0 )
         If nHandle == -1
           BoxWarning ( "Open error" )
         EndIf