I quit using opera back when v7 came out (dont care for the crap). But as for the previous versions, they "used" to have different codes based on the os. If i remember correctly, There were "W", "U", and "L" codes.

From: kclug-bounces@kclug.org [mailto:kclug-bounces@kclug.org] On Behalf Of djgoku
Sent: Tuesday, August 30, 2005 8:35 AM
To: kclug@kclug.org
Subject: Re: Opera ad-free reg key today only

On 8/30/05, Kelsay, Brian - Kansas City, MO <brian.kelsay@kcc.usda.gov> wrote:

I'd assume that the reg key could be used with any OS version of Opera,
but YMMV.

   For one day only, you can get an ad-free version of Opera.

    From Download.com, (and for one day only, valid from 12 a.m.
Tuesday, August 30      to 12 a.m. Wednesday, August 31 2005 (PDT)).

    Simply e-mail registerme@opera.com to obtain a registration code
Normally $39USD.

Thanks Homie!!

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