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Oracle Archive file

From: https://community.oracle.com/thread/1051216

You can delete .00* files, Oracle will need only arcgive logs files and backup to recover the 
database. 
Also check why these files are getting generated. They should not be generating if you do not need it.
In my particular case oracle\10g\RDBMS\ARCo3765_0691275168.001 ...
I copied the files to another location before deleting them

Database Administrator's Guide - Managing Archived Redo Logs

From: http://docs.oracle.com/cd/B19306_01/server.102/b14231/archredo.htm#i1006885

You can use archived redo logs to:

Recover a database

Update a standby database

Get information about the history of a database using the LogMiner utility