Put as nicely as I feel is possable:
I don't know what OS you're using, but in Windows, the registry is used by your OS, drivers and apps. Just because it's in the registry doesn't always mean it's used by the OS. That region code that you found in your resgistry is likly used by your DVD player SW.
A bit of friendly advice; you might want to take your own advice, and you might also want to fully read my post before you become so quick to reply next time. As I said before, even though your drive is region free, your decoder and play must also be region free, or you'll still be limited to the region that your region locked componits are set for.
FYI, there is no way you could have a Pioneer 303F, as Pioneer never made that model of DVD-ROM drive. Here's thier
current drives, and thier
older drives. Did you mean 303S, or did you flash it with a
modified firmware?
Also, I have a Pioneer 303S, it was RPC1 by default. Even thou it's region free, the drive still says it's a 303:
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: PIONEER Model: DVD-ROM DVD-303 Rev: 1.06
Type: CD-ROM ANSI SCSI revision: 02
If it's region locked, you'll see an R, after it's ID, to indicate that it's RPC2.
Finally, if you have a Pioneer 303s, make sure you didn't pull the RPC jumper. If you did, your drive is now RPC2, and DVDGenie's site says that DVDGenie won't work if you have a region locked drive.