On April 24, 2026, developer Hailey unveiled a tool called WSL9x on Codeberg. This innovative tool empowers modern Linux kernels (like Linux 6.19) to operate on Windows 95 and older Windows iterations (such as Windows 98 and Windows ME). Leveraging a collaborative mode, WSL9x facilitates the parallel functioning of two kernels under ring 0 privileges. This means users can seamlessly run Windows 9x and Linux applications side by side, eliminating the need for a system reboot.

WSL9x is composed of three key components: a modified Linux kernel, VxD drivers, and a console client. Remarkably, it doesn't hinge on hardware virtualization technology, extending its compatibility to processors as antiquated as the Intel 486. This breakthrough enables computers that are three decades old to run the latest Linux kernels and benefit from advanced features such as paging, memory protection, and preemptive scheduling.

Hailey disclosed that the project spanned six years and evolved from her earlier doslinux project. She emphasized that no AI tools were employed at any stage of the development process. Interestingly, coinciding with WSL9x's release, the Linux kernel community is actively phasing out support for the 486 processor.