Hp Openview Storage Protector and Rman

[Garyphoenixcontact]

I have a question about configuring an Rman backup script for Oracle8i using Storage protector. I have the syntax correct except for the format '<_%s:%t:%p>.dbf'. This format seems to work just fine for all HP-UX databases but yields an error on my Windows 2000 databases. Is there an add-on that needs to be purchased or can the format specification be properly configured for Windows 2000 databases? The errors received are as follows:
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03007: retryable error occurred during execution of command: backup
RMAN-07004: unhandled exception during command execution on channel dev_1
RMAN-10035: exception raised in RPC: ORA-19506: failed to create sequential file, name="AVESTAT_TRIAL<598030320>.dbf", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Vendor specific error: OB2_StartObjectBackup() failed ERR(-2)
RMAN-10031: ORA-19624 occurred during call to DBMS_BACKUP_RESTORE.BACKUPPIECECREATE

I know this is an error on trying to create the file, but how do I resolve this for Windows systems?

Thanks!