On April 25, 2024, Microsoft released the source code of MS-/PC-DOS 4.00 to the public.
While this release is exciting and essential to computing history, Microsoft’s release process was not entirely flawless: An accidental conversion from codepage 437 to UTF-8 destroyed parts of the source code and caused build failures.
In less than a week, on April 30, 2024, the community provided all necessary patches to restore the source code to its original state, matching the 1988 release of MS-DOS 4.00.
