7:Bad file name.
8:No room on volume.
10:File not found.
13:File not open.
14:Bad input format.
24:File not opened for reading.
25:File not opened for writing.
26:File not opened for direct access.
28:String subscript out of range.
29:Bad file close string parameter.
30:Attempt to read past end-of-file mark.
36:File type illegal or does not match request.
39:Undefined operation for file.