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by jart 2003 days ago
Author here. It's Vista+ because Cosmopolitan focuses on x86-64. Cosmopolitan does however support i8086 since these executables boot from BIOS. You can even define a _start16 entrypoint if you want to write real mode apps. No effort has been made to natively target i386, however it's still technically supported since Actually Portable Executables will re-exec themselves under qemu for other architectures.