It's FO2 RP or sfall credits, not the official FO2.
I helped killap doing beta tests on UP/RP and providing some technical support/suggestions. And I helped Timeslip testing sfall and contributing some minor code changes.
sfall has been included in old GOG release (she was hired by them at the time) and Interplay's Steam release (without asking her permission) as part of engine bug fixes for a long time. Bethesda is actually pretty nice (or just being cautious) to ask her permission when they re-release FO2 on GOG/Steam.
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