Rebboot Windows DB machine and database autostart with spfile

Hi all,  

By default database auto starts with init pfile when reboot windows DB machine. In order to make database autostart using spfile, I edited registry key ORA_<SID>_PFILE from '...\init<SID>.ora' to '...\SPFILE<SID>.ora', but database does not auto start when the service restarted or machine rebooted, seems it does not take the binary file.  

Is there a way to make the database service use spfile to auto start database on Windows environment?  

Thanks,

Lu    

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