By patch 1.7 "Hydra" (mid-2019), the 32-bit executable was removed entirely from the game’s Steam distribution. Since then, launching HOI4 on any modern operating system forces the 64-bit version.
: Major platforms like Steam have also ended support for 32-bit Windows systems as of early 2024. How to Play on a 32-Bit System
As of 2026, Hearts of Iron IV (HOI4) is strictly a 64-bit application and run on a 32-bit operating system
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