Read only tablespace ORA-01251: Unknown File Header Version read for file number

Hi I don't know if you know please how to fix this error
ORA-01251: Unknown File Header Version read for file number

The datafiles was copied, but for some reason in windows xp, (problem didn't
happen with other databases), can recognize a readonly datafile, then the
tablespace was offile, copying again and trying to put online I got the
previous error.

The datafile is there, all is ok, v$datafile checked, etc., I don't know if
there is a trick to fix it.

Thanks

Juan Carlos Reyes Pacheco
OCP
Database 9.2 Standard Edition


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