Usually, a "b" suffix stands for "Beta." But in this context, paired with the low version number, it likely denotes an internal testing build or a "B-side" compile. This suggests that "FILF 2 Version 001b Exclusive" was never meant for the general public. It was likely a build sent to a specific tester, a close circle of patrons, or a developer's backup that somehow slipped the leash.
Consistently visit her over multiple in-game days to raise her affection levels, which unlocks intermediate narrative cutscenes. Phase 4: The Simscape Minigame filf 2 version 001b exclusive
To play Filf 2 Version 001b Exclusive safely, always download it directly from the official developer channels. Usually, a "b" suffix stands for "Beta