Can you really delete tablespaces in offline/recovery 10gR2

Guru's,
I just migrated my 9.2.0.6 to 10.2.0.2 and in the process of moving my datafiles I messed up one of the names. I added the right datafile to the tablespace and the database started no problem. Now I have an extra datafile on the tablespace identified as offline needing recovery. I read that in 10gR2 you can delete datafiles from tablespaces so after mounting the database I ran -
SQL> alter database datafile '/data/ordata/prod/.dbf' offline drop;
Database altered.
SQL> alter database open;
Database altered.
When I select name from v$datafile it's still there. Am I missing something?
Thanks,
Kirk

http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14231/dfiles.htm#i1006556
You need to make the datafile online.
Restrictions for Dropping Datafiles
The following are restrictions for dropping datafiles and tempfiles:
The database must be open.
If a datafile is not empty, it cannot be dropped.
If you must remove a datafile that is not empty and that cannot be made empty by dropping schema objects, you must drop the tablespace that contains the datafile.
You cannot drop the first or only datafile in a tablespace.
This means that DROP DATAFILE cannot be used with a bigfile tablespace.
You cannot drop datafiles in a read-only tablespace.
You cannot drop datafiles in the SYSTEM tablespace.
If a datafile in a locally managed tablespace is offline, it cannot be dropped.

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Can you really delete tablespaces in offline/recovery 10gR2

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