Personally, Francis, I wouldn't translate it; the expression is SO universal, and so universally understood, there seems really little point — I think this term has now slipped into 'mainstream franglais', and while I always deprecate the use of an anglicism where a good French alternative term exists, personally, in this case, I think it is justified.

In any case, how many people understand exactly what is meant by it? I have seen it used in many ways, arguably with different nuances of meaning, so you might be well advised to 'leave well alone'!

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Note added at 26 mins (2006-10-31 09:17:55 GMT)
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Il ne s'agit pas d'un label/logo, ni d'une marque de fabrique... C'est simplement une façon d'exprimer la participation de tel ou tel logiciel / éditeur etc.

Au départ, je crois que ça vient du monde auto, où ça signifiait "avec moteur fabriqué par..."