Backup Recovery Trouble

Oracle 11gR2 EE on Windows 2008 Server

The previous (developers) maintaining this database never ran it in archive log mode and never backed it up. I am trying to clean it up and when exporting a schema, I get the folowing : 

ORA-39127: unexpected error from call to export_string :=SYS.DBMS_TRANSFORM_EXIMP.instance_info_exp('AQ$_JMSTOPICTABLE_S','LGDEV_SAN',1,1,'11.02.00.00.00',newblock) 

ORA-00376: file 66 cannot be read at this time

ORA-01110: data file 66: 'F:\ORADATA\LGDEV_FULL_SAN'

ORA-06512: at "SYS.DBMS_TRANSFORM_EXIMP", line 191

ORA-06512: at line 1

Is there a way to recover from this without backups ? 

Thanks