ORA-00376 file nn cannot be read...

     Hello,
     I have been getting this error when accessing Oracle.  I looked up the
     file number and determined that it is one of three datafiles
     associated with one tablespace.  When I went out to the operating
     system, the datafile is nowhere to be found!   What is going on? I
     hoped to find some explanation for the missing file (accidently
     deleted by someone or something) but so far I'm stumped.  The datafile
     still shows up when I query dba_data_files.  Any clues would be most
     helpful. Setup is: Netware 4.1  Oracle 7.1.3.3.2

     thanks in advance,
     Steve Will
     swill_at_ccmail.uwsa.edu